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It looks like he has the older VR without the lamps.

Well I would be cleaning all your connections and ground points. I'm not sure on the A0 trucks what the AC terminal on the VR is connected to - that terminal is an output from the VR and in the later trucks it goes to the LBCD and is the load sense used by the LBCD to disconnect the batteries...

What year is this truck? Does it have the LBCD or the PPD?

The original cartridge was still on my truck from 2008 when I got it (did not know this). Mind you it only had 2750 miles on it. It destroyed my compressor around 5800 miles on the odometer driving from Texas to Portland. The backpressure from the cartridge caused the compressor to overheat and...

Works fine for me anyway.

The filter is a desiccant cartridge and is sealed/consumable. The cartridge (this is only for the PURest dryer used on later A1's) is a Haldex DQ6050. All the parts are listed in the FMTV parts spreadsheet stickied at the top of this subforum.

Everything in the Hawaiian Army units rusts so badly it's almost sure to be corrosion related. Only place I've ever trained where we were replacing entire brake line kits on HMMWV's. Literally entire rubbermaid trash cans full of rotted out hydraulic brake lines. Had a hard top cab on a 5 ton...

Well this one is the Haldex PURest dryer on my 2008 A1R. Service takes about 10 minutes. You drain the air tanks, remove the 4 cover bolts, and pull the filter housing off. The filter turns 45 degrees and pops out of the housing. You clean everything, lube up the new o-ring and the one in the...

Get out there and service your dryer. Less than 1 year on this cartridge. Drain my tanks weekly (never any moisture I can detect), and daily drive my truck:

Service your dryer. Less than 1 year on this cartridge:

I'm in for 7 at least.

Deutsch and Amphenol have better pin density - weatherpack is 1980's technology. Note that there are multiple types and sizes of Deutsch connectors. DT, DTM, and DTP being the most common. If you truly want it to look the part then you go with Amphenol Mil Spec Aerospace connectors...

The drier needs to be serviced annually, or more frequently in wet climates. Mine was never serviced since 2008 when the truck was built and it destroyed my compressor on the 2700 mile drive home (truck had 2750 miles when I left TX, about 5400 when I got back to OR). I had no signs of anything...

Tried that before I left Texas with my truck. Worked for a short time and started leaking again. But my truck went to Kuwait and then lived in El-Paso the rest of it's life after so mine was wrecked with fine dust. The seals were garbage and weren't coming back for me.

Side note - this just means you need AC on your A0 truck and then the brake valve will fit the new AC center console correctly. Problem solved via application of wallet.

If there's ice in it you desperately need to service your air drier....... But really coachgeo has the right answer - rubber shrinks in the cold. The whole assembly is not that expensive - replace it and move on. If it's a PITA to get it out on the A0 trucks then this is an opportunity for an...

The seals in the control valve assembly have failed. This is the one you need: https://www.ebay.com/itm/164766081909 Mine did the same thing after years in the desert. I recall taking it apart and not really being able to fix it - don't recall off the top of my head why but I think it was due...

FMTV's won awards from the military for their outstanding reliability. They are one of the most reliable military vehicles the US has ever purchased. That said. Most that are available are 20+ years old, some approaching 30 years old, and the newest ones out there are at least a decade old...

24v into 12v can work great for reviving starters that have been sitting for a long time and trying to turn over engines that have been dormant for many years. I've seen guys use that technique successfully. You must be careful and do it sparingly of course or shit goes downhill in a hurry.

The end-bell of the Niehoff alternators is potted. You might be able to TIG weld a bolt or a tapered bit of all-thread to it in combination with some clever heat sinking and allowing to cool between short intervals of welding. It's not likely to ever have the strength it should have for this...