12 Circuit Wiring Harness Problems

[Jim Coleman]

Newly installed wiring harness is giving me problems.

Head lights work on high and low beam. Electric fan works on the radiator, electric water pump works, ventilation fans work.

Starter turns over; turn signal indicators and high beam indicator work. Instrument lights work when headlight switch is in park position.

Turn signals: all 4 lights flash on left and right from the turn signal lever.

Tail lights go out when headlights are turned on. Brake lights don't work.

I have a new CPP GM style tilt column without the key. Have a keyed ignition switch in the dash panel.

Thought it might be the turn signal switch, replaced it and it didn't make any difference.

Was told it was a ground problem, so I spent most of the day re-running the grounds, they now are all connected to the ground post on the battery. Each light has a ground that is attached to the main ground wire that goes to the ground post on the battery.

Replaced the flasher - it's flashing at a normal rate, but all 4 lights (including the license plate light) flash when the turn signal lever is put into position. I checked the wires that go to the column plug and they appear to be OK.

Any suggestions would be appreciated.

Thanks,

Jim