Brake Light Switch

Soft_Click

Soft_Click

Member
I’m getting my tail lights functioning now in my 1966 IH 1200A and can’t figure out how the brake light switch should work.

I can’t find anything even vaguely resembling a switch around the brake pedal. There’s a little four walled housing that looks like it might hold a brake light switch, but even that doesn’t totally make sense to me.

I think I’m missing the switch all together, but not sure.

Any help is much appreciated as always.
 
I believe my switch is bad, I used my ohm meter and had someone step on the brakes and it reads 1. I’ll replace that.

The leads going into the switch are a little weird too. So far my experience with the electrical in this truck has been strange, the colors of the wires don’t seem to mean anything. Like on this switch it’s black and green, with the black being hot in and green being hot out. The black is reading less than 2V, shouldn’t that be 12V? When I short those two wires the brake lights don’t come on, so I’m not confident there’s sufficient power there.

Also I just sent 12V straight down the green wire that connects to the stoplight switch and the brake lights didn’t come on so I’m thinking I may have three points of failure here.

once I replace the switch, can I send12V through it and out to the high power for the tail lights?
 
There isn't much of a color convention when it comes to IH electrical. Green wire was used heavily on their vehicles, especially in the sixties. Each circuit was identified with a unique number and where applicable a letter suffix at each termination point. All these decades later, sometimes you can make out those numbers on certain wires and sometimes not. Also, if previous owner repairs were made, be they necessary or not, if those repairs involved altering the original length of any wire, that could easily lead to the circuit ID being left on the cutting room floor.
 
I’m as guilt of this as anyone. For a while I only had black wire and used it for everything haha

I’m hoping I’m the last owner of this machine at least to save myself that embarrassment
 
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