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Old coils, worth saving?
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dembus
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PostPosted: Sat Sep 05, 2020 1:01 pm    Post subject: Old coils, worth saving? Reply with quote

Going through my spare parts and I have these. Is there a way to bench test them to see if they’re good or not?

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Danwvw
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PostPosted: Sat Sep 05, 2020 3:19 pm    Post subject: Re: Old coils, worth saving? Reply with quote

It's not an absolute on whether or not there good because really you need to check them at high voltage too but just check the. ohm readings Primary is about 1.5 to 3 ohms typically unless it's a low ohm aftermarket coil then they can be about 1 ohm and as far as the secondary goes (it's the Hi Voltage) it should be at or below 10K ohms to either of the primary's as read on the ohm meter.
Best test would be to put them one at a time on a car and drive it.
Probably scrap them if the oil has leaked out. It's the really bad stuff too! Don't want it in the environment or on your skin either. Technically because of the liquid transformer oil in them they are hazardous waist.
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telford dorr
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PostPosted: Sat Sep 05, 2020 5:59 pm    Post subject: Re: Old coils, worth saving? Reply with quote

Easy to test. Need a few things:

- a good 12 volt battery (car preferred; lawn tractor / generator OK. You can use your bus battery with a pair of jumper cables to remote the terminals over to your bench. Clip them to a piece of mop/broom handle so that they can't get loose and short to each other.)
- a vw condenser
- a secondary wire (distributor center wire)
- some clip leads
- an old coarse file

Connect the battery "+" terminal to coil terminal #15.

Connect the secondary wire to the coil centerpost. Clamp the other end so that it's about 3/8" away from the #15 coil terminal.

Connect the condenser lead to the coil terminal #1. Connect the condenser case to the battery "-" terminal.

Connect a clip lead between the file and the coil #1 terminal.

Connect one end of another clip lead to the battery "-" terminal. Drag the other end of the clip lead down the file teeth. You should get a shower of sparks between the secondary wire and coil terminal #15.
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Danwvw
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PostPosted: Sat Sep 05, 2020 8:08 pm    Post subject: Re: Old coils, worth saving? Reply with quote

That's pretty cool! I like it!
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dembus
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PostPosted: Thu Sep 10, 2020 2:38 pm    Post subject: Re: Old coils, worth saving? Reply with quote

telford dorr wrote:
Easy to test. Need a few things:

- a good 12 volt battery (car preferred; lawn tractor / generator OK. You can use your bus battery with a pair of jumper cables to remote the terminals over to your bench. Clip them to a piece of mop/broom handle so that they can't get loose and short to each other.)
- a vw condenser
- a secondary wire (distributor center wire)
- some clip leads
- an old coarse file

Connect the battery "+" terminal to coil terminal #15.

Connect the secondary wire to the coil centerpost. Clamp the other end so that it's about 3/8" away from the #15 coil terminal.

Connect the condenser lead to the coil terminal #1. Connect the condenser case to the battery "-" terminal.

Connect a clip lead between the file and the coil #1 terminal.

Connect one end of another clip lead to the battery "-" terminal. Drag the other end of the clip lead down the file teeth. You should get a shower of sparks between the secondary wire and coil terminal #15.


Very Cool! Thank you!!
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SGKent Premium Member
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PostPosted: Thu Sep 10, 2020 6:10 pm    Post subject: Re: Old coils, worth saving? Reply with quote

you can also turn the coil upside down and see if there is a VW part number on them. List the part numbers and we may be able to tell what they are for. Some may be 6V, some 12V and some for 12V FI systems.
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heimlich Premium Member
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PostPosted: Sat Sep 12, 2020 7:46 am    Post subject: Re: Old coils, worth saving? Reply with quote

Danwvw wrote:

Probably scrap them if the oil has leaked out. It's the really bad stuff too! Don't want it in the environment or on your skin either. Technically because of the liquid transformer oil in them they are hazardous waist.


Typically transformer oil is considered to be a carcinogen. I'd keep any VW stamped coils. They will be useful on a restoration.
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SGKent Premium Member
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PostPosted: Sat Sep 12, 2020 9:49 am    Post subject: Re: Old coils, worth saving? Reply with quote

heimlich wrote:
Danwvw wrote:

Probably scrap them if the oil has leaked out. It's the really bad stuff too! Don't want it in the environment or on your skin either. Technically because of the liquid transformer oil in them they are hazardous waste.


Typically transformer oil is considered to be a carcinogen. I'd keep any VW stamped coils. They will be useful on a restoration.

PCB is the culprit in the oil. PCB was banned in 1979. That is the year VW changed the top on coils in buses. Had a client in San Diego where an electrical transformer leaked on a power pole in his front yard. EPA and SDGE came in, moved everybody out of about 10 homes nearby, then scraped & replaced the top 1' of soil off most of the homes' front yards.
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Ted Williams has always been my hero since the very first time my dad took me down to their dugout after a game. They flew together in WWII. Ted liked to fish. Maybe as I get older it's time to do some fishing too. Smile Have a great day with your bus!
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