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.

[PaIsa]

Thanks for all the answer. I knew my initial message was not really clear, but here are some more details:

Wire going to the E-brake switch: The wire has been hacked through the years. A new cable was tied in to what seem to be the original cable in the tunnel somewhere between the 2 seats. The original wire seems to be brown-yellow, although I would have thought it would be brown-white. In the image blow, we see the wire going to the E-brake switch (yellow wire running behind were should be the driver seat. The tie-in to the original wire is where there is white electrical tape. We can see on this image that the car has the wiring for the seat belts, but they are not used. As for the switch, I cleaned the switch and where it makes contact to the body for the ground before reinstalling it. Now for the stupid question: When testing this cable/switch with a test light or voltmeter, I guess that with the switch in E-brake engaged position, I should measure battery voltage or the test light should come on (with ignition ON). Is that the case. If not then it means that it is grounding or disconnected elsewhere. But since the original wire is going literally in the tunnel, it will be difficult to track it down.



Hope this is a bit clearer and that it will bring some more good comments in trying to get this resolved.

Again many thanks.


Now for the wires near the brake fluid reservoir. I found those wires last week. Before I did not knew thay existed and the brake warning lights was always blinking. The wires were find in the way shown in the picture with one of the wire cut. Probably that before I found those, the cut wire was grounded making my brake warning light blinking. Now if I have the cut wires not grounded or connected, then my brake warnig light does not blink with the engine running (but it does light up with ignition ON). So I guess that the wires are part of this circuit, but was not able to find them or understand where they were on the wiring diagram.