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So, this is a weird one on me. Turns out the problem was the batteries. Bear in mind, the batteries were (apparently) fine -- I tested voltage on them yesterday, and I was able to start the truck up normally once, and then a very cold 3 or 4 crank start a second time, so they had charge. But...

Hey guys; So I have a 1989 M998 HMMWV with the 200 Amp dual-voltage alternator/generator and the HMMWV airconditioning kit installed from Midwest Military Equipment. My 12 volt output is wired to the "center" post of the batteries, and the AC unit takes its 12 volt source off the alternator's...

Hey guys ... I've been looking everywhere but I can't find a clear answer. Can you directly replace 7700 half-shafts with 10k halfshafts? How do you actually tell what kind you have? One of my half-shafts looks like it is about 3.5 inch in diameter, the other one seems like it's a little...

So! For anyone curious, here was the problem. On the negative terminal that connects to the truck, the cable was just loose enough on the bolt that it didn't have a good connection and was arcing. When I would go into the battery compartment and wiggle the cables around, it fixed the bad...

I had it on the outside, yeah, just to keep the moisture out. The first time I had this start problem, I cleaned every little bit of the dielectric stuff off *just in case* I had it wrong, and that didn't fix it. I'll be unbolting everything in the battery compartment and giving it a thorough...

Thank you, sir! I have ordered it and I will try it out.

Is this the switch you are talking about? The description on the Kascar site is ... very lacking :) https://real4wd.com/store/Switch,-Keyed-Ignition.-For-Humvee I've had some oddities with my ignition switch before (very rare) so I could believe this is a problem. I'll also be going through...

Thanks guys -- I will start going through all the groundings and see if that helps. I guess I was overconfident in my grounding harness and didn't even consider that it could be a ground problem.

Also, in case it is relevant, I have upgraded to the 200 AMP alternator. This was about a year ago.

Sure do. I have the KASCAR harness installed.

Hey there; I've got a 1989 M998 HMMWV with a strange starting issue that has cropped up recently. When I turn the ignition (I have the keyed ignition upgrade) to the mid position, WAIT light comes on, everything seems okay. I crank it, and it makes sad noise like there's not enough voltage...

From my reading, the 'proper' setting would be 0 3 for my truck. I'll probably get a bridge plate for it at some point, since I've already got holes drilled in the hood for it. And it's an interesting detail :)

Oh, that's very interesting. Thank you!

Hey guys; My HMMWV (m998) used to be a Corps of Engineers truck in the Michigan national guard. It's got this weird circular mark on the hood and a couple bolt holes, like something used to be there. I am wondering if anyone knows what it might have been. Here's pictures.

I had already tested the electrical and heard the 'click' from the solenoid before I posted this, actually. Also tested voltage level, etc. One of the first things I tested. I didn't tell the rebuilders that it was a 24 volt system, so that could be my problem there. Next time I am able to...

Yeah, I put the peg in the same place it was in when I removed it, and lined up the notch on the engine to the notch on the IP. Maybe I'm crazy but it doesn't look like there's really a way to put it in wrong, because of that peg... it won't mate if its in wrong? But anyway, I'm certain I put...

So the problem that I originally had is one day the HMMWV wouldn't start -- it was actually my daily driver, so I drove it every day. Up to that point, it started having some trouble getting started in the morning... I would describe it as "lazy", almost like I was trying to get it to start in...

Thank you, this answers my question perfectly!

I haven't checked that port, I will do so. My fuel filter I changed maybe 3 or 4 months ago. I've seen that video, and it shows the fuel coming out as a constant stream from that valve so I'll give that a try and see what happens. If its pulsing there, too, then I think I likely have a...

Hey there; I've been trying to diagnose some fuel problems with my HMMWV and I have a question that haven't been able to find an answer to. The vendor who rebuilt my Injector Pump asked me to gravity-feed some diesel in from a fuel can straight to the pump to diagnose why their rebuilt IP...