So, I'm still trying to roadworthy the '78, and I've run into another gremlin. The underhood wiring has been all chopped up, and I'm having a devil of a time trying to figure out what goes where. I'm still trying to get ahold of a shop manual, so I was wondering if anyone had a wiring diagram scan or something they could post. I need the underhood diagram for a 403 olds. The main thing I need to see is sending unit wires, and alternator wiring. The electric choke and the TH400 kickdown switch are both wired into the dark brown wire that comes off the alternator. I'm assuming this wire also is the same one that enters the harness along with the oil pressure sending unit, and a green wire (water temp sending unit perhaps?). Right now I've wired the dark brown wire that exits the harness at the front of the intake near the oil pressure sending unit, into the dark brown wire coming off the alternator, as this looked pretty natural. The big red wire coming off the alternator has been wired to the + side of the battery, spliced into the smaller guage wire on the batter post (not the large one that runs to the starter, the smaller one to the side of the terminal). Also, there is a black and orange wire that runs in the loom headed towards the distributor that has been cut, I'd like to see where that one goes too. All of the heater/ac wires have been cut out, and the horns are not currently working. Also, does anyone have any suggestions for a better place to splice in the kickdown switch (on the carb), and the electric choke, or is it fine to just leave them wired to the alternator (they are spliced into the dark brown wire which leads into the harness on the intake.) Once I can see a wiring diagram all my questions should be answered.
Thank you,
Levi
