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What do you all think may have happened here. M816, sitting 2 years. I put two hot batteries in it, hit the starter and clunk. Wont turn. I hit it 20 more times and notice the fan is moving. Hit it 20 more times and finally starts to turn, but by now batteries are low. Charging now for...

Normal for M38A1.

Maybe the thermal switch going out on the starter. Jump it out and see if that fixes it. Could be a dozen other less likely things.

Those studs are for supplemental armor. I have never seen any installed.

Kinda. It is called the LTAS cab, Long Term Armor Strategy. More about IED protection than heavy weapons.

Built 10/21/16 at Oshkosh, on the way to who knows where. Minor changes from Stewart and Stevenson, but more or less the same truck.

Close enough. What questions do you have?

Sounds like the alternator is intermittent. When it is faulting, check for excite voltage on the regulator terminal. If not, do the "suprman mod" (run a new excite wire from the fuel solenoid) or start troubleshooting. A relay in the pdp controls the excite. I would say you have 10 minutes...

Ouch 14 x $40= $560.

Agreed. The H1 engine is not very different than a Chevy van 6.5 TD with all computer engine management. In my opinion though, go with a GEP HMMWV pullout rather than a tired GM 6.5.

If by "internals" he was referring to the short block, that would be correct. The heads are different on the turbo 6.5 for the HMMWV.

The amp gauge in the instrument cluster. Known to overheat and cause high resistance to electricity flow.

Alternator, fan clutch, water pump come to mind.

The firewall mounted electronic device is the voltage regulator for the alternator. The fender mounted device is the ignition module. I have seen many of these where the substance inside (potting) has run out sitting on a shelf, so that does not mean they have overheated, just gotten old...

Drain the oil from the transfer case and rear differential and see which one has chunks of metal coming out of the drain hole. Then you will know.

Wow, did your truck suffer any damage like a scratch on the bumperette or a cracked tail light lens? Yup, sudden acceleration in an 809 has to be an unusual sensation.

Here we go.

I do. Where does it go?

Plenty of both battery and alternator capacity for those items. Get 12 volt power for the cab mounted items from the power pad to the left of the relays on the PDP in the cab.

You are quite correct. Memory failed me.