Got my brake warning light working!
The bulb had a purple/white and orange wire leading from it, so good start. Traced the purple wire to the firewall and then found it just ended in the engine bay not connected. Tested it, 12V, sweet. The switch on the proportioning valve was not connected to anything, so I spliced it to the purple wire. The orange wire from the bulb got lost into a bundle, but I hoped it ran to the ignition switch. The “P” tab on the ignition switch did not have anything connected, so I ran a wire from there through the firewall to the proportional valve switch (used the same splice). I wired it per the diagrams ASSUMING the purple and orange wires were still factory correct. Started the truck hoping to see the bulb test while in START and nothing. Bummer, at least I tried. My wife drove later that day and said the BRAKE light came on when she started and then it went out. Yippee! It works. Comes on nice and bright as a test during every start now. Not sure why it did not the first time.
Next step is to buy a switch for the parking brake and run that to the P tab and ground so the light comes on when parking brake is depressed. I was reading this thread:
http://classicbroncos.com/forums/showthread.php?t=263832
and bought the switch in post #20. $20 for a small cheap part! Got home and my parkaing brake looks nothing like the pic in post #10, so wouldn’t work anyway. Couldn’t take that overpriced switch back to the store fast enough. My Radio Shack closed, so I’m going to buy a long-lever switch off Amazon and use that.
The bulb had a purple/white and orange wire leading from it, so good start. Traced the purple wire to the firewall and then found it just ended in the engine bay not connected. Tested it, 12V, sweet. The switch on the proportioning valve was not connected to anything, so I spliced it to the purple wire. The orange wire from the bulb got lost into a bundle, but I hoped it ran to the ignition switch. The “P” tab on the ignition switch did not have anything connected, so I ran a wire from there through the firewall to the proportional valve switch (used the same splice). I wired it per the diagrams ASSUMING the purple and orange wires were still factory correct. Started the truck hoping to see the bulb test while in START and nothing. Bummer, at least I tried. My wife drove later that day and said the BRAKE light came on when she started and then it went out. Yippee! It works. Comes on nice and bright as a test during every start now. Not sure why it did not the first time.
Next step is to buy a switch for the parking brake and run that to the P tab and ground so the light comes on when parking brake is depressed. I was reading this thread:
http://classicbroncos.com/forums/showthread.php?t=263832
and bought the switch in post #20. $20 for a small cheap part! Got home and my parkaing brake looks nothing like the pic in post #10, so wouldn’t work anyway. Couldn’t take that overpriced switch back to the store fast enough. My Radio Shack closed, so I’m going to buy a long-lever switch off Amazon and use that.