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Well I did fry the light switch but I wanted to rewire that to a regular rocker switch so I did that and then found my mistake and rewired the brake controller signal from k6 to k10 and now it's all good.

I got it....but ya ik px 15 is the connector. I meant the k wire on it was shorted. But it ended up being that I had the trailer plug wired wrong and the brake wire was grounded in the trailer plug. It's all fixed again and I pulled 12v signal for the brake controller off of the output on k10...

Also of the 2 output wire from relay k6 one has short to ground the other is open. If I remove the grounded wire it won't blow a fuse but still no brake lights. The px15 k wire is short to ground.

Ya main light switch was bad you were right but I bypassed it to a regular toggle....now I have power at 2 of the brake switch terminals again but as soon as I hit the brakes it blows cb 70 and cb76 and shuts off....also noticed the lowest of the three 4 pole diodes on the panel melted a little...

Basically now when the trucks master switch is on or it's running it'll stay running till you turn the lights on then it'll blow cb70 and shut off.

So I did get it fixed well took the heater out and didn't find any damaged wiring at alll....but then after putting it back together I had 12v at the brake switches and the brake lights worked. Now I am putting a red arc brake controller and I was pulling brake light signal for it from the...

Having to find a short to ground on a ground switch circuit is something I'd never had to deal with till this definitely makes it difficult

I've had the whole dash out and the whole relay panel a few times now(the yellow locks for relay terminals were missing and dislodged), that and getting 12/24 relays to correct spot fixed 99% of electrical issues I had. But I didn't see any shorted wires....I'd guess it's behind the heater?? Or...

Thankyou so much for the explanation!! I think I got it I'll post back, hopefully with success this weekend when i get to the shop to work on the truck.

I have 2 brake switches...so both are in parallel ran to k6?

Yes they do and now that all makes sense Thankyou for that. If I run a new wire from the switches to cb76 that should fix it then?

Also seems there is something different about the 1088 brake wiring from one page I found in the manual.

Ya definitely no power at brake switches its a short to ground on all 4 wires. Going to look at the outputs on the main light switch and see if I have power coming out of what wire number??? This is my first military truck and God damn the wiring is complete bullshit... What is k6??? Or what is...

I am having the exact same issue with my 1088... -have all lights but brakes - hazards for some reason only light up in the front -no power at brake switch(all 4 wires connecting to the two switches at the foot valve are grounded.(probe power to any of the 4 on or off the switches and it pops...