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Author Topic: Bosch ignition coil terminal identification  (Read 2838 times)
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droptop
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« on: March 09, 2014, 08:40:56 AM »

I'm commencing work on my new spider project and the first item of business is changing the coil.
The car had a Ford coil with the ford bullet style connections connected to the original spade terminals via insulating tape so at least the original terminals are still intact.
Anyway, I have two Bosch coils of the correct type but instead of "+" and "-" they are marked "1" and "15" and even the wiring diagrams show the polarity as symbols rather than the numbers.
Can anyone tell me which is which? Huh?
Thanks
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HFStuart
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« Reply #1 on: March 09, 2014, 10:53:16 AM »

15 is +ve
1 is -ve
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droptop
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« Reply #2 on: March 09, 2014, 11:01:16 AM »

Thank you kindly.
That will simplify things, that and leaving the homemade immobiliser that was causing the intermittent spark failure disconnected!
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lukasdeopalenica
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« Reply #3 on: March 10, 2014, 09:25:30 AM »

Usually 15 is a battery +
These markings come from DIN (Deutsches Institut für Normung) and there you can find more electric terminal markings:
http://en.wikipedia.org/wiki/DIN_72552
In case of ignition coil it is supplied through an ignition switch

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