Brake warning light, The quest for success continues Options

[PaIsa]

So I am back trying to get my brake warning light to work properly. The situation before I started searching for the solution was the following:

Brake warning light was always blinking whatever the car condition. Blinked with the ignition ON. Blinked with the engine running and hand brake applied (normal). Blinked with the engine running and hand brake removed. Blinked with the engine running, hand brake removed and MC wire disconnected. So basically, blinking all the time!

So I was investigating the emergency (hand) brake wiring. Remove the seats, center console, etc. Looked at the emergency brake switch and seemed to work OK. There was a contact (closed circuit) when the switch was in position where the emergency brake would be applied and no contact (open circuit) when the hand brake would be removed. Looked on the wiring for evidence of short to ground but was not able to find anything. The wire goes in the center tunnel and is accesible until the shifter where rather then following the main wiring harness and the speedo cable, it goes under and God knows where it goes!! So I was not able to follow it all the way.

Now I have some disconnected wires near the brake fluid reservoir (already a thread on this trying to understand where these should go). The wires are brown-white and brown-white connected with a brown wire. The brown-white wire that is connected with the brown wire is cut.

So after I reassemble the emergency brake wiring, I did some test again.

Ignition ON, the brake light comes ON. Whit the engine running, no more brake light blinking.

So now I tried with the cut wire (the one near the brake fluid reservoir) reconnected. Brake light blinking all the time. Disconnect the wires, no more blinking when the engine is running.

I am lost. Even writing this I am not sure if I am right with the tests I did and the results I got.

Anyone has any advice? I looked at the wiring diagram, but not sure!!

I would like to have this working but don't want to go crazy with this!!

The car is a 1972.

[Literati914]

@Literati914

So was your harness brown/yellow all the way up to the back of the gauge and also down at the master cylinder switch?

I thought that was the case.. but I just checked. The wire going to my Ebrake handle is BR/YL (like the original poster verified his was originally)..while the wires going to my brake warning switch @ m/c is BR/WH (besides the BR ground wire).

Just a mistake on this particular diagram? I don't know, probably (IMG:style_emoticons/default/confused24.gif) . My harness is original, build date 05/72 I believe.

@PaIsa - I asked earlier, why the seat belt warning lines are disconnected... I understand it's popular because of the annoying buzzer but from memory I think it needs a particular "loop" of wire to bridge two points on it's relay (that's under the passenger's seat). I'm suggesting that if it's not correctly done it may cause a flashing light warning for the situation. Have you looked at the wiring under the passenger seat? I'm just guessing here.. but I'd check if you haven't already.