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Don't want to argue risks benefits of OEM boxes versus aftermarket. I have both AND a spare. Noticed reading about the topic corrosion within the boxes leading to the failures (albeit rare). The boxes themselves seem well built and well sealed with most likely water entry points being at 'top'...

My truck had aftermarket AC systems installed which includes heat. The heat blows well including on the defrost setting on the windscreen. But when the truck is traveling at speed I can feel very cold air getting through the defrost vents up top. How is this possible? Where is that cold air...

1. Does anyone make a stainless steel air valve? Non CTIS or CTIS? 2. Does anyone make a converter/cap that goes over the CTIS connector to make it a schrader valve?

Trying to pull out the steering gear/box. The TM doesn't specify sequence or tricks. I tried starting with intermediate shaft that goes to steering box........loosened the bolt/nut but can't get the shaft to release from the spline shaft of box. In other trucks the steering column will...

This is a separate but related question to my thread on steering gear box blow out. I want to move the truck a short distance but don't want to ruin the power steering pump as I can't keep up with fluid loss. If I remove the belt the pump won't turn so I assume that will save the pump. I...

Been snowing so I thought I'd take the truck out and help wife run errands. Ran perfect. Even wife like it. Then as we are pulling into drive I'm turning near lock to pull into drive way and feel it's getting hard to steer suddenly. Smell some type of fluid and some burnt smell but only...

Anyone know what the electronic relay for the TCM is rated for in Amps?? I was going to add another circuit or two. Because it's electronic I assumed it may not be rated very high.

My question ...... can a switch be placed that can control this?? Where and how would you splice in the 24V to disengage the solenoid/fan? The fan engages via the cadillac solenoid when it does NOT get 24V ....... by default if there is a fault/failure in sensor, the lack of 24V engages the...

I'm posting link to video. HMMWV Generator Pulley Noise On start up no noise. Generator pulley spins and generator charges batteries fine. On shutdown it makes noise and inner part of pulley/nut free spins for a few seconds and then stops. This can't be normal?!?! How do I fix this??

Just wanted to confirm the way the HMMWV shuts down is by de-energizing the fuel shut off solenoid on the injection pump?? I'm assuming this as there are no other electric parts other than glow plugs and starter on startup. But once started there is nothing else electrical keeping it going...

What is this for? I found what it was in TM. It sits behind the gauges. What happens if I remove it? It wasn’t plugged unto anything even though connectors there.

I have a military cutoff switch kit and it's instructions. It essentially cuts off the positive feed to the busbar from the front battery and the feed to (from) the voltage regulator and 12V circuit (TCM/circuit breaker) using a 4 pole/2 switch box. My concern is cutting off the positive feed...

Can it be done? I have a nato slave plug at front of battery box. I'm wondering if I used ground cables to go to and from the slave plug and essentially have the slave plug complete the 'circuit' whether or not this would work. I would need to modify the plug cap/cover so it would complete...

Is it ok if the glow plugs are wired 'out of order'? I'm assuming this is more for troubleshooting the harness and that the glow plugs are all activated at the same time. Also is this diagram accurate??

While the truck is up and running is it harmful to activate the glowplugs briefly? I have a camotek controller which allows be to turn on the glow plugs any time. I'm assuming there is no lockout similar to other controllers. I understand that other controllers sometimes 'cycle' the plugs for...

Can you test glow plug while still in block? I understand they should test between 1.5 and 5 Ohms with one probe on the connector tip and the other probe on the body at the threads. I have not read whether it is ok to test them while in the block and just test off the hex portion of the body...

I want to use US Shift controller but put it inside a HMMWV TCM box and use the original harness that the box uses. Currently I have a US Shift controller but it is spliced into a harness. I can’t tell if it’s one from US Shift or spliced into HMMWV harness from tranny. Can I go back to...

What type of water pump does the 6.5 A2 type engine take? This is serpentine belt. Looks like it’s the pump with the bolt on pulley. See link. https://flowkoolerwaterpumps.com/products/1677-1992-1999-chevy-gmc-hummer62l-6-5l-diesel-water-pump?_pos=1&_sid=22c64a6da&_ss=r

I’ve got a GEP 6.5 NA (add on BMI turbo) with a pancake compressor……..see picture with radiator pulled off. I want to remove the compressor. What do I have to do? Ignore the compressor pulley/tensioner and get smaller belt……and if yes how to route it?? Or do I put a pulley in place of the...

What is the purpose of the fuel sensor on the fuel filter housing?? What does it measure and where and how is the information used??