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Coil wiring on 74 beetle
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cetner
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PostPosted: Sat Jan 20, 2018 2:54 pm    Post subject: Coil wiring on 74 beetle Reply with quote

Hey everyone, I made a post on the gallery but I’ll post here too. I bought a 74 beetle (convertible) 2 days ago. The people we bought it from said all it needed was a starter, to start. Me and my stepdad are fixing it, and we started with installing the coil, we connected the wires where we believed they should go. Then started charging the battery, once it was charged we tried starting and nothing. We then we touched the wire in the picture to the coil and it started but then stalled out, assuming its the old gas that we will replace soon. So that wire obviously belongs, we don’t know where and what wires on there don't belong. So if someone can help guide me to the right thing, I’d appreciate it!

Thanks,
Christian
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67rustavenger Premium Member
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PostPosted: Sat Jan 20, 2018 3:05 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Black wire goes to the + side of the coil. The green one goes to the - side of the coil.
Image may have been reduced in size. Click image to view fullscreen.


The posts are marked +(15) and - (1).
Rotate/ orient the coil so the -(1) side is pointing toward the intake manifold. Otherwise it gets confusing for folks that have a similar issue.

Welcome to the samba.

Good Luck
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cetner
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PostPosted: Sat Jan 20, 2018 3:12 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

67rustavenger wrote:
Black wire goes to the + side of the coil. The green one goes to the - side of the coil.
Image may have been reduced in size. Click image to view fullscreen.


The posts are marked +(15) and - (1).
Rotate/ orient the coil so the -(1) side is pointing toward the intake manifold. Otherwise it gets confusing for folks that have a similar issue.

Welcome to the samba.

Good Luck


Thats where they are but the wire in the first picture is dangling and has no place, thats the one that started it. Do you know where it goes?
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Cusser
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PostPosted: Sat Jan 20, 2018 3:23 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

cetner wrote:
67rustavenger wrote:
Black wire goes to the + side of the coil. The green one goes to the - side of the coil.

The posts are marked +(15) and - (1).
Rotate/ orient the coil so the -(1) side is pointing toward the intake manifold. Otherwise it gets confusing for folks that have a similar issue.


Thats where they are but the wire in the first picture is dangling and has no place, thats the one that started it. Do you know where it goes?


Here's his first photo:
Image may have been reduced in size. Click image to view fullscreen.


The unattached wire is the wire to the reversing lights, it has an 8-amp inline fuse in the circuit, see it in the photo. That also goes to coil positive terminal #15, as should a wire over to the carburetor electrojet solenoid which also continues over to the choke heater on the carburetor.
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67rustavenger Premium Member
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PostPosted: Sat Jan 20, 2018 4:01 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Ah! I missed that cusser.

The red wire on the left of the carb. Where does that attach? That would be the idle cutoff solenoid cut off power. Without it attached the car may start when cold. But once it warms up. The idle circuit comes into play and the solenoid cutting off the fuel after the choke circuit has finished.
Of course. If this is the case. Then the choke(in theory) would not function. As they are wired together. But strange things happen in 40+ year old cars.

Good Luck.
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bluebus86
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PostPosted: Sat Jan 20, 2018 5:01 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

https://www.thesamba.com/vw/archives/info/wiring/Beetle_1973up_Clymers_3.jpg


also....

https://www.thesamba.com/vw/archives/info/wiringt1.php

Good Luck, Keepa Buggin!
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PostPosted: Sat Jan 20, 2018 6:00 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

I can not believe no one jumped on the get the fuel filter our of the engind compartment band wagon so. Remove the fuel filter that is in the engine compartment before you have a fire.
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Meiang
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PostPosted: Sat Jan 20, 2018 6:56 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Quote
"I can not believe no one jumped on the get the fuel filter our of the engind compartment band wagon so. Remove the fuel filter that is in the engine compartment before you have a fire"

If you use:
1) Quality correct size fuel hose.
2) Quality hose clamps which don't distort/damage the fuel hose or filter.
3) Quality fuel filter with the correct sized connections.
4) Route the fuel hose correctly and locate the filter so that it does not touch anything.
5) Check the above regularly.
there is no problem with locating the fuel filter in the engine compartment.

My experience is only based on 30 years + and over 500,000 miles of driving a Beetle in hot and rough road conditions.

If you comprise on any of the above then you may get a leak at some stage. Looking at most of the photographs on the forum where people put the fuel filter in the engine bay they often comprimise on one or more of the above points.

These days it is more likely for a fuel leak to occur when people install cheap fuel pumps or use cheap aftermarket fuel pump overhaul kits which leak because the rubber parts don't fit even after relocating the fuel filter.
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PostPosted: Sat Jan 20, 2018 7:22 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Meiang wrote:
Quote
"I can not believe no one jumped on the get the fuel filter our of the engind compartment band wagon so. Remove the fuel filter that is in the engine compartment before you have a fire"

If you use:
1) Quality correct size fuel hose.
2) Quality hose clamps which don't distort/damage the fuel hose or filter.
3) Quality fuel filter with the correct sized connections.
4) Route the fuel hose correctly and locate the filter so that it does not touch anything.
5) Check the above regularly.
there is no problem with locating the fuel filter in the engine compartment.

My experience is only based on 30 years + and over 500,000 miles of driving a Beetle in hot and rough road conditions.

If you comprise on any of the above then you may get a leak at some stage. Looking at most of the photographs on the forum where people put the fuel filter in the engine bay they often comprimise on one or more of the above points.

These days it is more likely for a fuel leak to occur when people install cheap fuel pumps or use cheap aftermarket fuel pump overhaul kits which leak because the rubber parts don't fit even after relocating the fuel filter.


Thank you Meiang.
Finally a sensible post about fuel filters in the engine bay.
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bluebus86
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PostPosted: Sat Jan 20, 2018 7:37 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Meiang wrote:
Quote
"I can not believe no one jumped on the get the fuel filter our of the engind compartment band wagon so. Remove the fuel filter that is in the engine compartment before you have a fire"

If you use:
1) Quality correct size fuel hose.
2) Quality hose clamps which don't distort/damage the fuel hose or filter.
3) Quality fuel filter with the correct sized connections.
4) Route the fuel hose correctly and locate the filter so that it does not touch anything.
5) Check the above regularly.
there is no problem with locating the fuel filter in the engine compartment.

My experience is only based on 30 years + and over 500,000 miles of driving a Beetle in hot and rough road conditions.

If you comprise on any of the above then you may get a leak at some stage. Looking at most of the photographs on the forum where people put the fuel filter in the engine bay they often comprimise on one or more of the above points.

These days it is more likely for a fuel leak to occur when people install cheap fuel pumps or use cheap aftermarket fuel pump overhaul kits which leak because the rubber parts don't fit even after relocating the fuel filter.


Of course moving the filter out of the engine bay can remove it from ignition sources so that if one fails to heed any one or more the five above listed points, a leak from the filter will not result in a fire. Why would I want to place the filter in a location that for fire safety requires me to regularly check it? (See 5). above). What if it fails between checks, what if I forget a check?

But hey, if you want to add one more item to check, you can do it without an increased fire risk. Move the filter and continue to check it, best of both worlds, a win win!

See also link at bottom of post regarding engine fires.

Good Luck Bug On, Dont burn.
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PostPosted: Sat Jan 20, 2018 7:43 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

bluebus86 wrote:


Of course moving the filter out of the engine bay can remove it from ignition sources so that if one fails to heed any one or more the five above listed points, a leak from the filter will not result in a fire. Why would I want to place the filter in a location that for fire safety requires me to regularly check it? (See 5). above). What if it fails between checks, what if I forget a check?

But hey, if you want to add one more item to check, you can do it without an increased fire risk. Move the filter and continue to check it, best of both worlds, a win win!

See also link at bottom of post regarding engine fires.

Good Luck Bug On, Dont burn.


There has never been a VW engine fire that was proven to have been started by a leaky fuel filter. EVER.

There. Settled.
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PostPosted: Sun Jan 21, 2018 9:38 am    Post subject: Re: Coil wiring on 74 beetle Reply with quote

sb001 wrote:
bluebus86 wrote:


Of course moving the filter out of the engine bay can remove it from ignition sources so that if one fails to heed any one or more the five above listed points, a leak from the filter will not result in a fire. Why would I want to place the filter in a location that for fire safety requires me to regularly check it? (See 5). above). What if it fails between checks, what if I forget a check?

But hey, if you want to add one more item to check, you can do it without an increased fire risk. Move the filter and continue to check it, best of both worlds, a win win!

See also link at bottom of post regarding engine fires.

Good Luck Bug On, Dont burn.


There has never been a VW engine fire that was proven to have been started by a leaky fuel filter. EVER.

There. Settled.


Here is one....

http://redrivervwclub.com/fuel-filters-and-your-volkswagen
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PostPosted: Sun Jan 21, 2018 9:55 am    Post subject: Re: Coil wiring on 74 beetle Reply with quote

bluebus86 wrote:
sb001 wrote:
bluebus86 wrote:


Of course moving the filter out of the engine bay can remove it from ignition sources so that if one fails to heed any one or more the five above listed points, a leak from the filter will not result in a fire. Why would I want to place the filter in a location that for fire safety requires me to regularly check it? (See 5). above). What if it fails between checks, what if I forget a check?

But hey, if you want to add one more item to check, you can do it without an increased fire risk. Move the filter and continue to check it, best of both worlds, a win win!

See also link at bottom of post regarding engine fires.

Good Luck Bug On, Dont burn.


There has never been a VW engine fire that was proven to have been started by a leaky fuel filter. EVER.

There. Settled.


Here is one....

http://redrivervwclub.com/fuel-filters-and-your-volkswagen


"Engine bay filters cause fires!"
"No they don't!"
"Yes they do!"
"No they don't"
"Yes they do"
....ad nauseum

It's a coil wiring thread guys, OP is trying to solve that problem.

If you want to debate the fuel filter (again) do it over here:
https://www.thesamba.com/vw/forum/viewtopic.php?t=136647
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PostPosted: Sun Jan 21, 2018 11:26 am    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Back in the day, Bugs would come in, maybe one a month, with the engine burnt to a crisp. The first few times, I just ignored them. After several months of this pattern, I started to get curious. I started to take note of the variables within those compartments. Bottom line WAS NOT the fuel filter being in the engine compartment. That would be the quick, uneducated guess, although it did contribute to the problem. It was, A FUNDAMENTAL LACK OF BASIC MANTENANCE PRACTICES! Basic, like in, adjusting the valves every 3000 miles and LOOKING at the fuel filter for any issues. Some of these cars never had seen a shop until they were towed in because of that engine fire. Some came in only for a major repair but never returned for standard setvices. Those cars are the ones that burned. How do I know.....Of the 2000 plus aircooled cars I worked on, that received regular maintenance (maybe 1000), not one of those ever burned, but several of the other 1000 did. This was the same for all of us wrenching in our shop.

Bottom line is, basic maintenance practices offset the need to relocate the fuel filter. I still keep my fuel filter in the engine compartment and I have never, in over 35 years, had an issue.

Do I think everyone should do as I do - NO! If you are unwilling to look at that fuel filter regularly and want to ignore it, you should relocate it. If you are going to be mindfull of it, then put it where you want to!
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PostPosted: Sun Jan 21, 2018 11:50 am    Post subject: Re: Coil wiring on 74 beetle Reply with quote

My own 1835cc engine, with metal fuel filter in my 1971
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When I resurrected my 1970 last year with rebuilt 1600cc, I initially added same all-metal fuel filter under the fuel tank, as some on The Samba have done. I rebuilt the original square-top Pierburg fuel pump. On two occasions, the VW stalled out while driving, lack of fuel getting to the carburetor. So I ended up removing that fuel filter altogether, just have the little conical filter inside the Pierburg fuel pump, as VW intended; and that has worked fine for me.

My 1970 fuel tank was not rusted even after 47 years, so I figure that I'm not likely to get crap in the fuel system. Gas pumps at the filling stations all have filters so gas delivered to your fuel tank is pretty particle-free.
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PostPosted: Sun Jan 21, 2018 12:35 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

AlmostHeavenWV_VW wrote:


"Engine bay filters cause fires!"
"No they don't!"
"Yes they do!"
"No they don't"
"Yes they do"
....ad nauseum

It's a coil wiring thread guys, OP is trying to solve that problem.

If you want to debate the fuel filter (again) do it over here:
https://www.thesamba.com/vw/forum/viewtopic.php?t=136647


You just proved my point for me. Every single time a thread comes up on here with a picture of said engine bay, someone goes off about how they are SURE to have an engine fire if the filter isn't moved. it gets old, tiresome, boring and it's WRONG on top of everything else.

At least Meiang, VW Jimbo, and others see the light.
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PostPosted: Sun Jan 21, 2018 1:35 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

sb001 wrote:
AlmostHeavenWV_VW wrote:


"Engine bay filters cause fires!"
"No they don't!"
"Yes they do!"
"No they don't"
"Yes they do"
....ad nauseum

It's a coil wiring thread guys, OP is trying to solve that problem.

If you want to debate the fuel filter (again) do it over here:
https://www.thesamba.com/vw/forum/viewtopic.php?t=136647


You just proved my point for me. Every single time a thread comes up on here with a picture of said engine bay, someone goes off about how they are SURE to have an engine fire if the filter isn't moved. it gets old, tiresome, boring and it's WRONG on top of everything else.

At least Meiang, VW Jimbo, and others see the light.


They started it, I'm telling Mom! Rolling Eyes Rolling Eyes


Bug On, Dont Burn!
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PostPosted: Mon Jan 22, 2018 12:37 am    Post subject: Re: Coil wiring on 74 beetle Reply with quote

You have a wire coming out of the car and that connects to the coil. Then you have the distributor which connects to the other side. Another wire connects from coil to the drivers side of the carb. Another wire connects from coil to passenger side of carb. That is all you need to start.

If the car has been sitting you should crank it awhile or prime the carb in order to get fuel running into the carb.

If you prime it and it runs but doesn't stay running you may have a fuel delivery issue.

These are what I consider the basics.
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PostPosted: Thu Nov 02, 2023 6:55 pm    Post subject: Re: Coil wiring on 74 beetle Reply with quote

67rustavenger wrote:
Black wire goes to the + side of the coil. The green one goes to the - side of the coil.
Image may have been reduced in size. Click image to view fullscreen.


The posts are marked +(15) and - (1).
Rotate/ orient the coil so the -(1) side is pointing toward the intake manifold. Otherwise it gets confusing for folks that have a similar issue.

Welcome to the samba.

Good Luck

What does the white wire do that’s connected the positive side?
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PostPosted: Fri Nov 03, 2023 6:37 am    Post subject: Re: Coil wiring on 74 beetle Reply with quote

Mexican beetle wrote:
What does the white wire do that’s connected the positive side?

I think it was for the diagnostic socket that started with 1971 year.
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