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You have already identified you do not have 12V at wire 657B so that is where you need to concentrate your investigation, make sure you have a good ground on your meter when checking voltage on 657B

It is easy enough to see if you have ground on 57T and 599A-B you just need a test light or meter, it ether has ground or not. the trans will not shift if 57T or 599A-B does not have ground.

Unplug the wires to the valve, this should give you 100% fan on to get you home.

I do not see a 57C but other than that you are correct, you need to figure out why you do not have 12V on 657B when the ign. is on (DO NOT forget to unplug the glow plug temp sending unit while troubleshooting the trans) 657B is the female (protected) terminal in the plug that connects to the...

With a whopping 250HP (with electronic control) I doubt it would be a game changer.

I installed a 6l80 in a M998 the at the time had a 6.2L and had no issues running in 6th accept going into a headwind, this was a helmet top that weighed about 8K of course it is pretty flat around here on the coastal plains, it could also be set up to be able to switch to manual shift mode and...

I have not actually listed it, I am hoping to get my knees replaced this year and then I hope this project will become more appealing to me, I am building this thing to drive being the only fully street legal "sand rail" in Texas, (apparently) but as it stands now getting in and out is an...

IMHO the only reason every HMMWV that comes out of surplus does not need a complete brake overhaul is because of the DOT 5 fluid, every vehicle with DOT 3 that I have seen that has sat for 5-10 years has crap for a brake system and I have seen a bunch of them. Yes if you get water in it you can...

I am however considering selling the entire project.

No, the center pod is part of the dash and I have no interest in cannibalizing it. I restored the old dash, the "spare" new dash is blank

That would not have anything to do with the trans light, if the lamp is good then ether the wires have an issue (there should be +12V on one side in the run position) or the TCM is bad. Actually if you do not have a TCM as in retrofitting earlier vehicles with the 100/200A alternator grounding...

Your truck has a 4 speed so there should be a wire from the 14V stud on the regulator to the 12V connection between the batteries, without it the batteries will be unbalanced and die an early death. I doubt very seriously the gen not having a ground wire will start a fire, the gen will ground...

I am not a big fan of the supplemental grounding harness, IMHO it can create unintentional ground loops that can cause problems. Everything on a Humvee has a specific ground path, the body itself is not used for grounding, everything grounds through a small number of grounding points. The plan...

Yes they are somewhat finicky, mostly caused by bad ground connections. Start at the batteries and check the large cables first, there are bulkhead connections though the battery box that should be checked/cleaned on both sides, then the ground cables to the starter and the back of the engine...

Welcome to the SS forums!! 3C is the gen to body ground, what is the small wire number? what was it connected to? Also it would be helpful if you include the model number of your truck

Welcome to the SS forums!! You could try United Parts Service in CA, others will also have some good sources to contact.

My advice would be get a 6.5L NA, I did the 6.2/6.5L GEP turbo swap in front of a 6L80 and the resulting increase in performance was negligible, no mods needed for the NA and with the turbo there was more increase in heat than performance. Did you use the 242 or 218 TC and if so how did you...

Yes

Try Lightstream they do however favor folks with good credit. if not the rates can be as high as 25%

Yes, but you will need a different rear front shaft and rear shaft and possibly a new rear yoke.