Chrysler 115hp wiring questions

[ybor_knight]

I am trying to rewire the gauges and switches to a 1978 BassCat with about a 1977 Chrsyler 115hp Charger motor (model #1159H8B). I managed to get the pumps, lights, and switches running fine (all very simple), I have numerous questions relating to the gauges though, primarily the tachometer,temp gauge, and key ignition posts. First off let me share what I have labeled on the motor's terminal block,the key ignition's posts, and wiring on the tach gauge:

Motor Terminal
Yellow (Start)
Purple (Generator)
White (Tachometer)
Green (Choke)
Orange (Heat)
Red (Battery +)
Blue (Ignition)
Black (Ground -)

Key Ignition Posts
M, I, M, S, C, B

Tachomter Gauge Wires
Purple
Black
Gray
Blue

There was originally a buzzer attached to the orange wire from the motor which I thought was strange because I assumed the orange (Heat) would be a temp gauge send wire. I ended up cutting that buzzer completely out and using the orange wire to the send on my temp gauge, not sure if I was right??
I believe the tach was somehow wired into the buzzer, but now I can't remember how it was done. Something else I found odd was that the tach was wired to the purple (generator) wire from the motor. I ended up disconnecting that and taking the purple wire from the tach gauge to the ignition post, connecting the black wire from the tach gauge to the black (ground -) wire from the motor, connecting the gray wire from the tach gauge to the white (tachomter) wire from the motor, and linking the blue wire from the tach gauge to other wires feeding gauge lights.

I don't think I have done this correct because now I have the purple (generator) wire from the motor going to nothing and the buzzer is no longer in the system. I could use some help. What is the buzzer for and how should it be wired in? How should the tach gauge be wired in? How should I have the key ignition wired? Currently I have nothing going to the M posts on the key ignition, the red (battery +) going to the B post, the green (Choke) going to the C post, the yellow (start) going to the S post, the blue (ignition) going to the I post, and the feed to my fuse box for my accessories going to the I post.

I would really appreciate some help so I can get through this project and test her out. I got a lot done this weekend, but I ran into some roadblocks of confusion there at the end.

 

[Fairlane62]

Re: Chrysler 115hp wiring questions

I tried tracing the wires as best I could. Hopefully this will help, I'm not sure how much is original.

My tach is not connected, and only has two wires, but it looks like it originally had the blue wire going to the red terminal on the distributor, and the white wire to ground.

I'm not sure if it is a buzzer, but the orange wire goes from it to the temp sending unit, and the black wire goes to the ignition switch (See below). It may be used in place of an idiot light to warn you of an overheat condition.
My purple alternator wire is not connected, but it terminates under the console, so it probably is supposed to go to an ammeter. The red alternator wire goes to the starter solenoid.

Ignition switch may not be original as not all of the wires are the same color as the main harness.
Ignition switch wiring:
- Black wire goes to "buzzer" which goes to temp sending unit.
- Red goes to terminal block on motor which has a red wire going to the ignition module and the voltage regulator. Another red wire goes from the alternator to a small relay/switch on the side of the engine block. A red/white striped wire then goes to the batt side of the starter solenoid.
- Yellow/black striped wire connects to green wire in harness which goes to the electric choke. (You push in on the key to activate the choke)
- Purple connects to the blue wire in harness which connects to the red terminal on the distributor.
- Yellow connects to yellow/red stripped wire in harness which goes to the small terminal on the right hand side of the starter solenoid.

Hope this helps, let me know if there are any specific wires that you need traced.

James