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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