View Single Post
Old 01-26-2020, 09:06 PM   #11
Jeff M
Join Date: Nov 2011
Location: CA
Posts: 88
Default Re: Brake Light Switch Backwards

Originally Posted by alexiskai View Post
If the ammeter shows a discharge when you press the brake pedal, even though the light is out, that would indicate that pulling the tab in the brake light switch is creating a short circuit rather than closing the circuit to the light. That's why I asked about the ammeter.

I don't have the engine ready to fire yet, I was just testing the wiring off the battery.

Originally Posted by Patrick L. View Post
The switch probably works fine. To check the switch just use a test light or volt meter. Make sure you have constant power to the switch. On the early transmission mounted switch there should be no power thru the switch until the pedal is pressed. On the the later crossmember mounted switch there should be power thru the switch and the pedal when pushed opens the switch.

Where is the early type switch mounted ? It needs to be mounted as the early type switch on the transmission. That switch is normally open. Depressing the pedal then closes the switch and therefore the circuit.

The 30-31 switch mounted on the crossmember is normally closed and releasing the pedal on that type switch opens the circuit.

I have it mounted in the correct spot, I'm using an aftermarket battery box with hydraulic brakes.
Attached Images
File Type: jpg brake switch edit.jpg (89.2 KB, 115 views)
Jeff M is offline   Reply With Quote