ignition/coil wiring 72 chevy p/u - Hot Rod Forum : Hotrodders Bulletin Board
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Old 12-19-2002, 02:40 PM
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Post ignition/coil wiring 72 chevy p/u

1972 chevy pickup, half ton. v8

so pretty much when I got my truck the wiring was partially removed, no coil etc.

Anyways i have all the neccessary *parts* but hooking them together is my problem. I should mention it does turn over.

So I have a purple wire from my starter going inside, I assume thats to the ignition switch.

A green coming off the other side of the starter, connected somewhat ghetto to a yellow wire, and it was left lying around on top so I assume it goes to the coil... weather positive or negative, I don't know, I haven't plugged my dc cord in to test.

Theres the distributer wire... which runs from the coil to the distributer... through a resistor... weather this is the positive or negative wire.. I don't know..

And lastly... shouldn't my coil get a +12 somewhere? where does that wire come from?

(to simplify I need an simple ignition system diagram... and haynes doesn't have a 72 chevy diagram)

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Old 12-19-2002, 07:21 PM
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icegnome,
You are correct on the purple wire, it goes to the igniton switch and goes to the crank side of the ignition (post on the igniton, which has 12 volts when the igniton is in the crank positon), cranks the engine over.

The green wire that comes off the starter, goes to the positve side of the coil. This gives the coil power while cranking.

You will also need a power wire off of the igniton switch that supplies power when the ignition switch is in the run position. This is the 12 supply while the truck is running.

So once you let go of the crank positon, power switches from the starter to the igniton switch and the truck stays running.

The other wire between the coil and distributor should go to the Negative side of the coil. The other end comes from the points or magnetic pick-up in the distributor.

I hope this helps, if it isn't clear let me know, I will draw you a diagram.
Sparky
*

Last edited by Jon; 04-17-2005 at 02:38 PM. Reason: advertising
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Old 12-21-2002, 05:59 AM
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i have a 72 chevy and sparkys right on the wires.when i got my car it had extra wires sticking out and i didnt know what to do with them either. but i know i had and still do have a yellow wire that went to the starter. i cut it off because i cant figure where it goes and it doesnt effect my ignition at all. unlesss it went to the traditional points distributer which im guessing you have.
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