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speedystar77 Samba Member
Joined: June 26, 2015 Posts: 76 Location: South Central Idaho
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Posted: Sat Oct 17, 2015 6:47 pm Post subject: Reverse lights question 1974 Westy Baywindow Bus |
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Are the wires attached to the reverse light switch in the above photo? What are the two empty terminals on the nose of the transmission? (For orientation, the empty terminals point to the front of the bus)
I'm holding the wires coming from the switch on the transmission. One should go to an inline fuse (currently missing for some reason) then to the coil and the other to the reverse light terminal hanging in the background?
Thanks for looking! |
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akscooter Samba Member
Joined: September 25, 2008 Posts: 528 Location: Eastern Washington
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Posted: Sat Oct 17, 2015 7:10 pm Post subject: |
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one goes to the spade terminal coming off the left taillight the one to the left in your picture, the other goes to the positive side of the coil, or a keyed power. there should also be a fuse inline also. _________________ 1975 campmobile
1949 Ply Special Deluxe
1991 Custom 1200 HD Sportster XLH |
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aeromech Samba Member
Joined: January 24, 2006 Posts: 16926 Location: San Diego, California
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Posted: Sat Oct 17, 2015 7:18 pm Post subject: |
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I have no idea what that other thing is on the tranny nose. _________________ Lead Mechanic: San Diego Air and Space Museum
Licensed Airframe and Powerplant Mechanic
Licensed Pilot (Single engine Land)
Boeing 727,737-200-300-400,757,767
Airbus A319,320,321
DC9/MD80
BAe146
Fokker F28/F100
VW type 1 1962,63,65,69,72
VW Type 2 1971 (3 ea.) 1978, 1969
VW Jetta
VW Passat
Capable of leaping tall buildings in a single bound |
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Tcash Samba Member
Joined: July 20, 2011 Posts: 12844 Location: San Jose, California, USA
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Posted: Sat Oct 17, 2015 8:48 pm Post subject: Vacuum advance cutoff |
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72-74 Except 74 Manual Trans.
Last edited by Tcash on Mon Nov 02, 2015 9:36 am; edited 1 time in total |
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sjbartnik Samba Member
Joined: September 01, 2011 Posts: 5986 Location: Brooklyn
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Posted: Sat Oct 17, 2015 10:08 pm Post subject: |
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And you don't want that vacuum advance cut-off switch hooked up. _________________ 1965 Volkswagen 1500 Variant S
2000 Kawasaki W650 |
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ChipWrecked Samba Member
Joined: October 08, 2012 Posts: 89 Location: SE PA
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Posted: Sun Nov 01, 2015 5:35 pm Post subject: |
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sjbartnik wrote: |
And you don't want that vacuum advance cut-off switch hooked up. |
Why?
I ask b/c I'm in the process of gathering missing parts to hook up my 72' as stock.
Switch is item# 211905521 btw - very little info on it. |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51057 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Sun Nov 01, 2015 7:26 pm Post subject: |
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ChipWrecked wrote: |
sjbartnik wrote: |
And you don't want that vacuum advance cut-off switch hooked up. |
Why?
I ask b/c I'm in the process of gathering missing parts to hook up my 72' as stock.
Switch is item# 211905521 btw - very little info on it. |
Remarkably that system is one of the few things VW put on that really detracted from performance, it's a way to get around new emission laws that came down that year and it does marginally reduce some sort of combustion byproduct, but the extra gas used to overcome the loss of power likely cancels that out in the big picture. Put it in for decoration if you are building a museum peice, but it'll be a happier bus if it doesn't work. _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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ChipWrecked Samba Member
Joined: October 08, 2012 Posts: 89 Location: SE PA
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Posted: Sun Nov 01, 2015 8:08 pm Post subject: |
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busdaddy wrote: |
Put it in for decoration if you are building a museum peice, but it'll be a happier bus if it doesn't work. |
Thanks - you undoubtedly saved me several frustrations. |
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Amskeptic Samba Member
Joined: October 18, 2002 Posts: 8568 Location: All Across The Country
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Posted: Mon Nov 02, 2015 8:36 am Post subject: |
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busdaddy wrote: |
Remarkably that system is one of the few things VW put on that really detracted from performance, it's a way to get around new emission laws that came down that year and it does marginally reduce some sort of combustion byproduct, |
The vacuum advance cut-out helped to keep the air injection exhaust afterburners hot and active around town. You think I kid . . .
Remember, every VW under full throttle has no vacuum advance, so it wasn't that noticeable of a deterioration in poerformance.
When i think of how many FI buses-with-leaky-EEC-valves are out there with utterly no vacuum advance as a result . . .
Colin _________________ www.itinerant-air-cooled.com |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51057 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Mon Nov 02, 2015 8:39 am Post subject: |
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Amskeptic wrote: |
When i think of how many FI buses-with-leaky-EEC-valves are out there with utterly no vacuum advance as a result . . .
Colin |
Excellent point!
So if running the complete full meal deal smog system it's useful, aside from that not so much. _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
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SamboSamba22 Samba Member
Joined: August 06, 2015 Posts: 2772 Location: Benton, Arkansas
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Posted: Sun Sep 25, 2016 5:08 pm Post subject: Re: Reverse lights question 1974 Westy Baywindow Bus |
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So doing some research on why my reverse switch wasn't working, I came across the issue of incorrect wiring.
Regardless I removed the original VW switch, cleaned it well, and hooked it up. As mentioned, one black wire (with inline fuse) goes to the (15) terminal on the ignition coil. The other black wire coming from the switch goes to the covered spade out of the left rear taillight housing.
Here it is in its 40 year old oily glory:
Here is the two wires coming from the engine bay:
Cleaned up and installed on the driver-side of the transaxle, you can see the part # of the VW reverse light switch. This is on a 74 manual Westfalia.
_________________ The Bus Barn Ltd. Co.
Oct. ’67 Double Cab (’68 Crew Cab)
[url=http://www.vw-mplate.com/mplate-44412.png]Click to view image[/URL]
March '69 Delivery (Panel Bus)
[url=http://www.vw-mplate.com/mplate-44414.png]Click to view image[/URL] |
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SamboSamba22 Samba Member
Joined: August 06, 2015 Posts: 2772 Location: Benton, Arkansas
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dr8track Samba Member
Joined: July 18, 2005 Posts: 496 Location: Seattle area
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Posted: Sun Apr 11, 2021 9:10 pm Post subject: |
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busdaddy wrote: |
ChipWrecked wrote: |
sjbartnik wrote: |
And you don't want that vacuum advance cut-off switch hooked up. |
Why?
I ask b/c I'm in the process of gathering missing parts to hook up my 72' as stock.
Switch is item# 211905521 btw - very little info on it. |
Remarkably that system is one of the few things VW put on that really detracted from performance, it's a way to get around new emission laws that came down that year and it does marginally reduce some sort of combustion byproduct, but the extra gas used to overcome the loss of power likely cancels that out in the big picture. Put it in for decoration if you are building a museum peice, but it'll be a happier bus if it doesn't work. |
I was searching old threads to see if I could find out why my reverse lights are on constantly and I ran across this info about not hooking up the vacuum advance cut off switch. My mileage is horrible ( 7 mpg) which I'm fairly crtain is primarily due to adjustments needed on my Weber Progressive Center Mount carb. The bus runs great as far as I can tell, but clearly somethings not right with that kind of mileage.. So I need to get something done to the carb to improve mileage, but if my 74 has a vacuum advance cut off switch and if it's hooked up, could disconnecting it at least gain me some extra mpg?
Oh, and the question I was originally trying to find an answer to, why are my backup lights on all the time? _________________ 1974 Westfalia Deluxe Campmobiles - Lake Stevens, WA |
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telford dorr Samba Member
Joined: March 11, 2009 Posts: 3547 Location: San Diego (Encinitas)
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Posted: Sun Apr 11, 2021 11:39 pm Post subject: Re: Reverse lights question 1974 Westy Baywindow Bus |
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Your tranny backup light switch is either shorted internally or stuck. Remove and test with an ohmmeter. _________________ '71 panel, now with FI
'Experience' is the ability to recognize a mistake when you're making it again - Franklin P. Jones
In theory, theory works in practice; in practice, it doesn't - William T. Harbaugh
When you're dead, you don't know you're dead. The pain is only felt by others.
Same thing happens when you're stupid. - Philippe Geluck
More VW electrical at http://telforddorr.com/ (available 9am to 9pm PST) |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50261
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Posted: Mon Apr 12, 2021 2:01 am Post subject: |
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dr8track wrote: |
My mileage is horrible ( 7 mpg) which I'm fairly crtain is primarily due to adjustments needed on my Weber Progressive Center Mount carb. The bus runs great as far as I can tell, but clearly somethings not right with that kind of mileage.. So I need to get something done to the carb to improve mileage, but if my 74 has a vacuum advance cut off switch and if it's hooked up, could disconnecting it at least gain me some extra mpg? |
You need to verify that your timing is correct to start with. 7 mpg is so low that your engine should barely be running. Throw in new points and set them to a .018-.020" gap, and then time your engine to 28-30° BTDC @3800+ rpm, hoses off and plugged. If you have a dual vacuum can on the distributor you do not want to reconnect the retard side of it, only the advance.
You need to make sure your distributor is properly lubricated as well according to the manual and that both the vacuum advance and the mechanical advance both work. |
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Abscate Samba Member
Joined: October 05, 2014 Posts: 22573 Location: NYC/Upstate/ROW
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Posted: Mon Apr 12, 2021 3:32 am Post subject: |
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dr8track wrote: |
busdaddy wrote: |
ChipWrecked wrote: |
sjbartnik wrote: |
And you don't want that vacuum advance cut-off switch hooked up. |
Why?
I ask b/c I'm in the process of gathering missing parts to hook up my 72' as stock.
Switch is item# 211905521 btw - very little info on it. |
Remarkably that system is one of the few things VW put on that really detracted from performance, it's a way to get around new emission laws that came down that year and it does marginally reduce some sort of combustion byproduct, but the extra gas used to overcome the loss of power likely cancels that out in the big picture. Put it in for decoration if you are building a museum peice, but it'll be a happier bus if it doesn't work. |
I was searching old threads to see if I could find out why my reverse lights are on constantly and I ran across this info about not hooking up the vacuum advance cut off switch. My mileage is horrible ( 7 mpg) which I'm fairly crtain is primarily due to adjustments needed on my Weber Progressive Center Mount carb. The bus runs great as far as I can tell, but clearly somethings not right with that kind of mileage.. So I need to get something done to the carb to improve mileage, but if my 74 has a vacuum advance cut off switch and if it's hooked up, could disconnecting it at least gain me some extra mpg?
Oh, and the question I was originally trying to find an answer to, why are my backup lights on all the time? |
No, the advance cut off won’t hurt mileage or performance. It’s much more likely your carb isn’t jetted right or the distributor isn’t matched.
Test the transmission switch to see if it’s passing the 12 volts through regardless of gear position, or use an ohmmeter to see if it closes in reverse, and open circuits otherwise. If you need the step by step on this, post back, please. _________________ .ssS! |
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Wildthings Samba Member
Joined: March 13, 2005 Posts: 50261
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Posted: Mon Apr 12, 2021 12:33 pm Post subject: Re: Reverse lights question 1974 Westy Baywindow Bus |
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If not having a vacuum advance didn't hurt either performance or gas mileage, VW would not have spent the money to add it. Especially with a progressive carb the difference is apt to be very noticeable. |
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mikedjames Samba Member
Joined: July 02, 2012 Posts: 2714 Location: Hamble, Hampshire, UK
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Posted: Mon Apr 12, 2021 12:50 pm Post subject: Re: Reverse lights question 1974 Westy Baywindow Bus |
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That kind of mileage, its amazing it runs..
I get 18 mpg (US) out of a progressive.
But if the fuel metering valve in the float chamber starts to leak , the carburettor drains excess fuel down the throat of the carburettor.
With the tune on my progressive, that stops the engine and it floods and it is time to buy a new valve.
And when the engine is stopped and the tank is full it would keep dripping into the oil too (why I have a shutoff solenoid in the line from the tank).
About every 15000 miles, it wears out the valve.
Back on topic.
If the reversing lights are on all the time then either the switch is faulty, the two wires to the switch are shorting or the wiring is wrong. _________________ Ancient vehicles and vessels
1974 VW T2 : Devon Eurovette camper with 1641 DP T1 engine, Progressive carb, full flow oil cooler, EDIS crank timed ignition.
Engine 1: 40k miles (rocker shaft clip fell off), Engine 2: 30k miles (rebuild, dropped valve). Engine 3: a JK Preservation Parts "new" engine, aluminium case: 26k miles: new top end.
Gearbox rebuild 2021 by Bears.
1979 Westerly GK24 24 foot racer/cruiser yacht Forethought of Gosport.
1973 wooden Pacer sailing dinghy |
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dr8track Samba Member
Joined: July 18, 2005 Posts: 496 Location: Seattle area
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Posted: Tue Apr 13, 2021 5:50 pm Post subject: Re: Reverse lights question 1974 Westy Baywindow Bus |
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mikedjames wrote: |
Back on topic.
If the reversing lights are on all the time then either the switch is faulty, the two wires to the switch are shorting or the wiring is wrong. |
I'm thinking the switch is faulty since it worked fine previously, but for the life of me I can't locate that switch. I'm not certain how different the engine is between the posters 71 and my 74, but I can't find anything that looks like the switch in his photo. I've crawled around and looked, but can't spot anything with a couple wires attached. _________________ 1974 Westfalia Deluxe Campmobiles - Lake Stevens, WA |
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busdaddy Samba Member
Joined: February 12, 2004 Posts: 51057 Location: Surrey B.C. Canada, but thinking of Ukraine
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Posted: Tue Apr 13, 2021 6:01 pm Post subject: Re: Reverse lights question 1974 Westy Baywindow Bus |
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When under the bus on the LH side of the transmission look for 2 black wires above the clutch cable, the switch is on the very front of the transmission near the shifter shaft. _________________ Rust NEVER sleeps and stock never goes out of style.
Please don't PM technical questions, ask your problem in public so everyone can play along. If you think it's too stupid post it here
Stop dead photo links! Post your photos to The Samba Gallery!
Слава Україні! |
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