brake warning light and disc brakes on a 67

[fordman]

the 67 wirign harness has one wire going down to the brake warning light switch. not two wires to complete the circut liek the 68-79 trucks do. which the 67 is wired to work fine like it is with just the one wire from the switch and into the min harness to complete the circut.

however. once disc brakes are installed. how would a person go about using the disc brake proportioning valve and the single wire into the 67 one wire circut for the disc brake proportioning valve switch. since it would have two wires coming out of it? where would you run the second lead to and where would it hook in. does it have a positive and negative flow to the two wire system?

[ForingaMex]

Just attach the single wire onto anyone of the wires on the switch or you can even join both wires from the switch together and attach it to the single wire from the 67. There is no positive/negative on that switch. I think we explained this a little while ago already but here we go again. The brake warning light is supposed to light up when you start the truck (as long as the ignition switch is in the 'start' position) to show that the light works. The 68 and later trucks are wired so that if the wire connector at the brake warning light switch is not plugged in properly, the light won't come on when you start the truck. If the light doesn't come on when you start the truck it means there is something wrong with the wiring somewhere or the bulb is burned out. That is the best way I can explain it. Others might be able to give you much better info.

[Thunderfoot]

Didn't we cover this before, more or less? http://fordification.com/forum/viewtopi ... =8&t=50556