How many wires does a coil need? - Alfa Romeo Bulletin Board & Forums
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post #1 of 8 (permalink) Old 07-03-2019, 05:29 PM Thread Starter
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How many wires does a coil need?

I was looking around the engine bay of my Spider and trying to straighten out some of the wiring and noticed the ignition coil has about 8 wires going to the Power Terminals, around 4 each. Is this normal? Or did someone try to pick up power and ground where they shouldn't.

Thanks for you input.

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post #2 of 8 (permalink) Old 07-03-2019, 06:03 PM
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Sounds like someone added a few. Here's a photo of what is 'normal' for a Series 3 Spider (USA versions).
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post #3 of 8 (permalink) Old 07-03-2019, 08:03 PM Thread Starter
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Do you know why there are four wires going to the one terminal, that seems a bit excessive. I am used to american cars however, never worked on an Italian one before.

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post #4 of 8 (permalink) Old 07-03-2019, 08:11 PM
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The negative side on a Bosch car will have one to the tach, one to the ECU, I think. Not sure about the third. Positive side will have 12V coming in, sometimes folks add more leads there, basically as a handy source of switched 12V.

The wiring diagram is in the owner's manual.

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post #5 of 8 (permalink) Old 07-04-2019, 08:44 AM
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Diagram for an '88 shows wires from the negative side to the tach, ignition ECU, fuel ECU and to the fuel pump. It shows just 2 to the positive though.
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post #6 of 8 (permalink) Old 07-04-2019, 06:42 PM Thread Starter
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thank you for your reply, unfortunately I did not receive an owner's manual with the car.

al

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post #7 of 8 (permalink) Old 07-04-2019, 06:45 PM Thread Starter
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Thank you for the diagram Chris, that makes sense.

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post #8 of 8 (permalink) Old 07-05-2019, 07:36 AM
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Quote:
Originally Posted by niebor View Post
Thank you for the diagram Chris, that makes sense.
Sure thing. PM me with your email address and I can send you the entire color-coded diagram (r.i.p. Papajam).

Chris

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