I've been chasing ground and electrical issues on my 1967 Firebird that are causing inconsistent instrument warning light problems. Thanks to all the expert advice here, I have most of them fixed now. I am down to one remaining issue. My brake warning light slightly glows on when the car is running and when the ignition is in the Acc position. I have tested the park brake switch and the brake distribution block switch with my multimeter and by grounding each wire to make sure the lights come on. Both switches test correctly when in the on and off position.
The only way I can get the light to go off is to unplug the brake pressure switch. At that point, the park brake still works as it should. But,I would not have a warning light come on if there is an actual problem with brake pressure in the future. Before I throw another $100.00 at a new switch, I wanted to see if anyone else has had this issue or if there is another test I can do. To clarify, I removed the distribution block and tested Ohms between the block housing and the switch connection. This test showed a completely open circuit (1 on my Ohmeter). When I take a small pick or drill bit and stick it in the front or back brake line hole and push it, the OHMS go to zero which grounds the circuit and the light comes. Even though this switch seems to test okay, I think it must be the issue since unplugging this switch is the only way I can get the slight glow to go off.
