Re: 1937 120 Conv. Sedan - Blanche

Posted by HH56 On 2024/4/6 13:17:57

That sounds good as to where you have power. Where you do not also sounds good because unless the engine is running the cutout relay in regulator would be open so nothing on A, F and G or ground.

There is a bit of discrepancy between the factory and AEA wiring diagrams on exactly where a wire connection to the starter switch is located but both agree the voltage comes from the same place.

AEA diagram is easiest to trace and it shows voltage originating at the starter solenoid BAT terminal and going to ammeter via a red wire. AEA shows black wires out of ammeter passing that voltage to the regulator, ign switch, headlight switch input terminal and the starter button. Discrepancy is where the starter button is actually tied to be powered from. AEA has it from ammeter, factory has it from the headlight switch input terminal which comes from ammeter so essentially the same place. You might see if you have power on the power input to the headlight switch.

What can be confusing is the factory originally had the starter being able to crank engine at all times although the engine would not start without the key on. When later models came out with the starter button powered thru the ign switch so it only worked with the key on some changed their earlier cars with always active starters to match later models. In that change the starter switch is fed from the ign sw GA terminal instead of ammeter or light switch. As to not having power on one side of starter switch and solenoid, that would be correct unless the button was pushed. Power on the other side would depend on whether the feed wire came from ammeter or ign sw.

Horns take a lot of current so make sure the feed wire is 12 ga and has good tight terminals. Might also double check to make sure the wires are on the correct relay terminals. B is bat, H is horn and S is the button. If the battery feed is not on the correct relay terminal nothing works.

No reset button on the regulator.