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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...