One is the switch for the brake light and the other is the switch that tells the transmission controller that the brake is applied.
Synchronizing both is a nightmare cause of short pedal travel of the HMMWV!
I have therefore switched the Siganl for the transmission control unit via a relay. I pick up the brake light directly at the bottom of the switch and operate the Reais. Result = 100% synchronous, always!
What I can not believe so reht is that your HMMWV is a 12V vehicle. Who on earth converts a HMMWV to 12V? And why?
when I bought this vehicle it was supposed to be parts truck, most wiring was cut and parts missing.
No starter
No generator
No control box
no PSB box
Broken lights
No gauges
so I thought to myself, I had 12v shut of solenoid laying around, I said let me try to start the engine and see if it runs, if it does I won’t part it out,
Sure enough it started rights up.
at that point I had to choose to stick to 24v and source all the parts, or swap to 12v and use parts that I already had.
believe me I wish it was 24v original wiring is extremely well built.
but now it’s all done and everything is
All properly wired and vehicle is drivable,
I am using stand alone transmission controller
12 v glow plugs
Manual glow plug heater with ford starter solenoid
8 groove pulley on a Ac DELCO alternator.
it’s actually very simple reliable setup.
