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Well if you remove K6, and disconnect the brake switch terminals, you should measure 12V on pin 86 of the relay socket and you should see no path to ground on pin 85 Of the K6 relay socket. If you do it is shorted… I think that wire follows the bundle along behind the heater…

No there are 2 ways to control a relay. Connect one side of the coil to ground and switch power on and off to the other side of the coil to control current flow, or connect one side to power and switch the path to ground on and off to control current flow thru the coil. K6 is a ground switch...

That is correct. Of the 4 connections on the switches, 2 should go to ground and the other 2 should go to K6 pin 85. Since they are spliced together and only one wire for each wire actually makes the journey across the dash to the ground terminal buss and the relay, I would be looking for a...

If you pull relay K6 out of the panel do your brake lights go out?

K6 is the stop relay in the power panel…. CB76 is a circuit breaker…. If you are measuring ground on all 4 brake switch terminals(only 2 connect to ground), you probably have a short in your dash wiring between the switches and relay K6. That path to ground is keeping K6 energized and the...

Brake lights get prime 12v power from the main switch. It has to be on to power K6. with the main sw on you should see 12v on one terminal of the brake light switches. It flows from switch, past K2, thru CB76, thru the coil of K6 to the brake switches.

What year truck? Since these beasts were pre-configured to both tow and be towed as well as run blackout, they have a really complicated light system… because of this, you could have something activating the lights even though the pedal is not depressed… The brake switches on the treadle...

Take a good look at the strap on the starter, it is the most important one…

oops, double tap…

The main truck ground is a strap between the starter negative terminal and the left side frame rail…, so it goes from battery neg terminals(furthest from the frame) to the starter neg terminal via large gauge cable, then there via a ground strap to the frame. The A0 had a instrument shunt in...

So what is the measured resistance of your injectors? Are they indeed shorted? I am not specifically familliar with the cat HEUI ECM, but I seem to recall reading about configuring/matching injector settings. If the ECU was multi purpose it may be able to drive different types of injectors...

I got mine from a GP auction outo of JBLM. The truck was located at their lot in Fife near tacoma narrows bridge, so about 2 hours to get it home to Port Angeles for me. These trucks go to excess for a reason, but I was looking fir a project truck and I got a very good deal… That was also just...

What truck is this on(A0 or A1)? What lights are staying on? What are you turning off?

That is correct. It should only have air coming out that port when you release the pedal or release the park air to set the park brakes, and then only as long as it takes to vent all the braking air. There should be no steady leak. If there is, it is either leaking past the treaddle valve or...

Well you don’t really have 100A available. The batteries need to get back to full charge. A 240AH bank is looking for 25% of the AH capacity from the alternator(AGM’s are looking for 45%), So those 60 amps are spoken for until the batteries are charged. Since the bank is so large this could...

Yes, behind the passenger side panel, all the way over under the dash to the right…

Dont think the a1 manuals have been officially released yet. At any rate what you really need is someone with the hardware/software to read the J1939 data-bus to see what issues/code the ABS has specifically…. It is a commercial ABS system so the manufacturer will probably be more help there…

If the tires are leaking down, it is most likely a wheel valve. You can confirm this with a wrench and a rubber glove. Disconnect the banjo bolt and put a rubber glove over the fitting and tape it in place over the fitting on the end of the hose… if it inflates, the wheel valve is leaking...

Which is why I buy pretty good tools…

Yep, thats its purpose. It is supposed to be able to leak past to self release once the load is removed. Perhaps that bypass clogs over time…