vette427sbc
Well-known member
Putting my new harness back in the car and I went to go test it today before everything goes back together. Battery hooked up to the main power wire that goes to the starter lug, grounded on the birdcage....
Heres my setup:
Painless Universal 18 circuit harness. Push start with separate ignition and acc switches each to trigger a relay. The only wiring change I did was that the coil wire is triggered by the same relay as the ignition wire. I thought no problem, the ign powered stuff will just stay on during cranking. No biggie since theres not much else that will draw power as its cranking.
Starter relay works fine, acc relay works fine. Ignition is somehow backfeeding from the fuse box to the relay. Heres where it gets odd... Its not the relay. It will show voltage at the wire with the relay out. Getting more odd... Battery reads 12.5 volts. Everything that should be getting power reads the same. The backfeeding ign wire will read anything but 12.5v. 11v, 4v, .1v. It seems to change everytime I test it. Now this is all happening with NOTHING hooked up. no lights no gauges, literally nothing. Just un-terminated wires. The only current draw in the system right now is the relays.
This harness is simple, and I checked everything over. I cant seem to figure out what would cause this wire to somehow obtain less than the supply voltage. Is it possible that since nothing is hooked up I am getting this weird reading? This only happens to ign, acc and starter wires are fine.
:shocking:
Heres my setup:
Painless Universal 18 circuit harness. Push start with separate ignition and acc switches each to trigger a relay. The only wiring change I did was that the coil wire is triggered by the same relay as the ignition wire. I thought no problem, the ign powered stuff will just stay on during cranking. No biggie since theres not much else that will draw power as its cranking.
Starter relay works fine, acc relay works fine. Ignition is somehow backfeeding from the fuse box to the relay. Heres where it gets odd... Its not the relay. It will show voltage at the wire with the relay out. Getting more odd... Battery reads 12.5 volts. Everything that should be getting power reads the same. The backfeeding ign wire will read anything but 12.5v. 11v, 4v, .1v. It seems to change everytime I test it. Now this is all happening with NOTHING hooked up. no lights no gauges, literally nothing. Just un-terminated wires. The only current draw in the system right now is the relays.
This harness is simple, and I checked everything over. I cant seem to figure out what would cause this wire to somehow obtain less than the supply voltage. Is it possible that since nothing is hooked up I am getting this weird reading? This only happens to ign, acc and starter wires are fine.
:shocking:
