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This is one I've never heard before. I suppose it might be possible to damage the box, but I don't really see how if the start switch is turned off and the batteries are connect AND you didn't do something stupid like hook up a dumb charger backwards or something. The batteries should act as a...

Only if it has an equalizing function. It's much better to charge them individually rather than together otherwise, so 2 12V battery tenders would be better. Battery tenders are more for maintaining than charging, so it would take a while to bring the battery with lower state of charge up to...

So the theory goes that the first battery in the string will charge more than the second battery in the string over time. Something about the first battery possibly pulling more of the amps/current/whatever before it gets to the second battery in the string. This in and of itself isn't a big...

So the M1123 is an M998A2 with a heavy suspension and a couple other differences. It's still an M998 for most parts purposes, especially for things like tops, doors, lights, etc. To know all the actual differences you'd have to look through the parts manual, but mostly just treat it as an...

unless you have an issue with your wiring somewhere, then it's likely the compressor. I believe the red dot systems use a Sanden compressor, which takes SP-15 oil, rather than PAG-15 (not sure what the difference is, but Sanden likes their own oil better)

Here is a link to the Red Dot service manual. It's for civilian systems, but it's still just a basic aircon system, so it works. https://www.btrac.com/documents/rd-service-manual.pdf The only real difference in the civilian systems and military systems looking at the images is that the...

I run the M1-302A as well. It's ranked as one of the best filters out there from my research. (it's not actually on the list below, but it's a slightly upgraded version of the M1-302) http://www.hummerknowledgebase.com/parts/list/005.html

Personally for diesel I use BIO KLEEN for Biocide, but mostly because it's available at all the local farm supply stores. https://powerservice.com/psp_product/bio-kleen-diesel-fuel-biocide/ For storage I like to use Star Tron enzyme fuel treatment. It will even work on fuel that is turning...

just make sure the oil filter has an anti-drainback valve in it.

so last thing to do is verify if the fan is disengaging properly. With the RPMs up a bit (like 1500ish) it should be very noticable if the fan kicks in or if it was already on when unplugging the cadillac valve or time delay module (as system defaults to "engaged")

I'm looking at the different parts websites, the 998A0/A1 6.2/6.5 detuned thermostat is rated at 190 (fully open) and the A2 trucks are 190F or 195F, so the fact that your truck is getting up to those temps leads me to believe the thermostat is functioning properly. The first few hundred miles...

So now with everything back together, was going to drive the truck out to a job today. Up to this point I occasionally had the charging system flake out on me during startup. It would barely show starting to charge then stop (the needle would move up to the green briefly between two pulses of...

There are a bunch of M1123s that ended up not being used and have been getting auctioned off. The tag on it says the truck had 26 miles when it went through rebuild, and it had 32 when I bought it (so actually only 6 miles on it after rebuild) Going by the condition of everything, other than...

So got the parts I needed in this morning. Worked for a few hours to get everything put back together. Well, that was after I had to take it further apart first. To get the oil filter adapter off you have to disconnect the driveshaft from the front and remove the bolts for the intermediate...

1) So the wiper motor has contacts under the windshield that are notorious for bad connections. Fold the windshield down and clean the connections. Some people use a small washer or similar in there to create more pressure on the connection. 21V is too low, you should see full battery...

Now I really want to know what's in the mystery bag (only thing I did have on that list other than the wiper arms was the CDR valve, because mine was before they started butchering the DWF parts) Luckily wiper arms seem to be universal with jeeps and some other vehicles, so you can get some...

Mine didn't have any cushions or seat bases, just the seat back that doubles as the floorboard when laid down. If it's like my truck was, there will be a lot of random 1/2" bolts, nuts, and washers, as well as a few brackets and plates left over from when they removed the MAK (Marine Armor Kit)...

It's tempting, but I really hate dealing with having to ship stuff, especially truck freight.

There is still always the chance it is defective or something causing it to stick open, so removing it to verify it's opening temps is still advisable.

It will only disconnect the fan when pressure is built up in the system, the only way to really check with the engine running is use something like a 2x4 to GENTLY rub against the fan to see if it slows it down. Even with pressure in the system and the clutch disengaged the fan is going to...