I need help with what I believe is a mid to late 70's voltage regulator wiring.



The voltage regulator is on a 1972 F series (F750), but according to the parts store this regulator is from the later 70's.



The white wire coming out of the S terminal was connected somewhere I think under the dash - but Im not sure, at some point it came loose, and since then the alternator will not charge the battery.

To limp it home I connected that wire to one of the terminals on the solenoid, and then the battery was charging. (I can't remember where exactly I hooked to on the solenoid). But was told not to leave the wire hooked there permanently.

It is my understanding that that wire needs to go to switched power.

Where should this wire go? In the event I cant do that - where can this wire go so that the charging system runs right?

PS since this a bus chassis the fuse boxes arent necessarily "normal" so I dont know if I can run the wire straight too the fuse box somewhere.

Thanks in Advance

 

I would not put a lot of faith in the color coding of the wiring you have. My 74's are all black. Here's a diagram:
http://www.junkyardgenius.com/charging/ford02.html

 

Thanks for the diagram, I will check out the alternator and see if I have that connection, and if its open, I will try connecting there.

I agree with the wiring colors, there is no telling how many people have worked on this thing over the years, but the way I see it, I don't care what color it is as long as I can figure out how to make it run. lol Like I said I think it was originally run to under the dash somewhere. This is my first foray into any type of wiring troubleshooting so I am learning as I go. After I get this - then I can start on the parasitic draw. lol

Actually, I just looked at the diagram some more. The diagram shows four wires from the regulator terminals, I A S F, but on mine the I wire is missing umm..... thoughts anyone?