502 injector wiring help - Team Camaro Tech
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post #1 of 2 (permalink) Old Jul 31st, 06, 07:33 AM Thread Starter
Join Date: Jul 2006
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502 injector wiring help

My boss does not have internet access so this is an attempt to help him out.

We have put a 502 in a '68 Camaro. The end of a 9 year restoration is in sight, and would be finished if the thing would run. Here is the deal. When you plug the elctric connectors into the injectors on the fuel rail, one side should be hot and one side should be ground. In this case, both are hot and thus stopping the injector from injecting fuel into the cylinder. In the instructions for installation, there were three wires to bolt to the back of the block. Two were solid black wires and one was black and white. The two black ones were supposed to be mounted to stud #1 and the black and white one was to be mounted to stud #2. Boss was determined to mount them all on stud #1, so he did. I conviced him to change this finally. We think the problem might be in the relay box, but aren't sure. Any help would be appreciated.
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post #2 of 2 (permalink) Old Jul 31st, 06, 08:32 AM
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Re: 502 injector wiring help

You're trying to set-up "batch injection." One wire on the injector connector goes to fused 12 volts. The other side goes to the ECM box, or as you call it, relay box. I don't think it would be ground all the time, I could be mistaken not reading the instructions.

By wiring up both sides of the injector to one stud, no damage has been done, yet.

Here's wants happens, battery voltage is applied to the injector, voltage goes through the coil winding and ends up at the relay box/ECM. For injector to work, there must be difference in potential, difference in voltage read across the coil. This accomplished by placing a low (ECM) or ground (relay box), onto one side of the injector coil winding, current flows, injector opens, fuel is dispensed. Ground/low goes off, injector closes, fuel does not flow.

Hope this helps. By wiring both to the same stud(s), incomplete circuit, no current flows, nor fuel.

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