well I was looking for a 2-page wiring diagram. When "mustang wiring diagram" is typed to google it will find many of them but just for the 68 year 2nd page is unreadable
What is it you are trying to troubleshoot, or are you building your own wiring harness? Is there a wire that you can't figure out where it is going or what it is supoposed to operate?
Oh yea, that will get you. The ground is the heater control head plate. It needs to touch the dash...The fan switch case is the ground...I bet you have the control head out and the fan won't work?
Well I was wondering how to wire heater motor that never worked & I don't know if it is original to the car. It has "6-cyl" written on it too while I should have 67 v8 car with 68 wiring. The motor has male orange and female black wire, while both yelow and brown have female ends. But your "ground" explains everything.
One more question - should the brown wire be hooked to the motor's black or orange wire?
It's odd how they did it, the brown wire in the car harness goes to the orange wire on the motor, the yellow wire in the harness goes to the black wire on the motor.
Hey All,
Resurrecting an old thread with some new questions concerning the diagrams that BarnStang was kind enough to post a link to. Specifically page #5 of 22. Please look at the area near the alternator and solenoid and note and trace wires numbered 655, 654, 37, 38A "and" the wire that I think is incorrectly labeled "3". This should show you the source of my confusion. I'm trying to determine why my "alt" gauge does not work and when I look the wires mentioned, I'm scratching my head. Especially with the fact that 655 & 654 that go to the "alt" gauge appear to originate/connect together at the alternator/solenoid end? Any help and/or guidance will be appreciated. This diagram (from other sources also) and one other hard to read one seem to be the only ones out there for a 68.
Thanks,
Gene
The Alt gauge measures differences in current flow. One wire #654 is spliced to the alternator Batt feed and the other #655 connects to the Batt post in the Starter relay (solenoid). When the alternator charges there is a higher current signal at the Alt then there is at the solenoid. The gauge measures this difference and uses it to indicate if the car is charging or not. The difference is usually so slight that the gauge hardly recognizes it. Circuit #3 is very short and I guess it changes at the splice to #37 which feeds the Fuse box. Or, if it is a incorrectly labeled, it came that way from Ford.
mustangmutt,
That is the exact schematic I was referring to. Definitely different for 67, Maybe I'll check a 69 for $h!t$ & giggles. I read somewhere (long ago while my car was not running) about some sort of shunt or something that needed to be there for the gauge to work? Even with a severe discharge or recharging and nearly dead battery, the gauge does virtually NADA.
Thanx,
Gene
If you really want to see that needle move try disconnecting #655 from the relay and extend it inside the car and connect it to the power supply at the ign switch.