Join Date: Mar 2002
Location: Austin, TX, USA
Re: ignition help
What gave you the impression the brown wire was a ground? Was it a voltage measurment or a resistance measurment?
I doubt that a brown wire is a ground. Grounds are almost always black and are bonded to the chassis a multiple points.
According to the AIM manual, the brown wire provides power for the radio, heater, wipers. The brown wire is not fused...it essentially supplies power to specific fuses.
I WOULD NOT DARE GROUND IT.
There is also a brown wire with a white stripe originating at the same point on the ignition switch which is a resistance wire. It loops between ACC (or is it IGN) power and the gen lamp circuit. It is a wire cut to length to provide a certain amount of resistance. Both ends of the wire terminate in the gauge cluster and ignition switch branches of the harness. But it also loops clear down by the heater duct before doubling back. It is supposed to keep the alternator excited when the GEN lamp burns out.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI