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Most likely AGM had to agree to purchase X number of components to get them custom made to AMGs specs, really cannot blame them for trying to protect their interests, I would. Moog likely believed there would not be enough aftermarket sales not to require a minimum commitment from AMG unlike...

Sure looks like it is not charging, IGN is correct to excite the alternator, will not be anything at AC if it is not charging, 12V term looks right for not charging.

On the basic the solenoid just powers the blower and excites the alternator, you could put a volt meter on the ING/EXCITER terminal of the alt to see if that is the run solenoid cycling, probably is, I would assume that solenoid powers the AC blower on AC versions. That cycling of course is not...

The instrument cluster is powered directly off of the run switch so it will be off when in the stop position including the volt meter. I had an EESS do that for a while, it was turning off and on the run solenoid in the EESS box, if the blower was on it would cycle with the clicks as the blower...

Next time it does it turn the heater blower on and see if the blower is going on and off.

Does it stop after a couple minuets? also curious do you have an electric fuel pump?

Ditto

NEVER use starting fluid on the engine, period.... Does sound like you need to trouble shoot the glow plug system. You can get a block heater for a civy 6.2/6.5L diesel, try to get a good one ( AC delco etc,)

Have you put a meter on it?

Replacing the fuel filter immediately is a must do. https://real4wd.com/product/filter-fuel-hmmwv/ You should change all fluids and filters, you have no idea what was used correct or not before you took possession of your truck, not to mention it has sat for years, you have no idea if it had...

The engine and transmission filters can be obtained locally, IIRC the fuel filter is not, look to a vendor like Kascar for that.

It necessarily must have a tap for the 12V, that connection has to be between the two batteries, what I am saying is I only see the wire/fuse to the aftermarket equipment, I do not see any other tap.. Check the schematic on the file I listed and see if you have that wire connected.

A couple things, the voltage should not fluctuate until the main timer has timed out, 8 seconds or so, then it goes into "after glow" where the EESS turns on and off the glow plugs to keep them warm for about a minuet or so, then they turn off. If the wait light is just "blinking" and the EESS...

I just do not see any other 12V connection in your picture, the pic does not completely show the connection between the batteries, there must be a 12V feed to the transmission, maybe I just cannot see it. So they just left the breaker flopping around?

This blade fuse laying on the batteries.

The fuse located in your second picture above, I am sorry I did not know this truck had been "ungraded", the manual is pretty much useless you have to figure out what the guys doing the upgrade did, but one thing is for sure, the TCM/trans runs on 12V that aftermarket fuse lying on top of the...

There is a power relay somewhere for the TCM, follow that wire from the fuse with the red leads going into that plastic wire loom, that wire loom would not be what I would expect but there must be a wire leading from the connection between the batteries (12V tap) to the TCM and power relay for...

Adding another light would be easy just wire it from the cold side of the switch to ground. This of course should be the second lamp added, the first and one that everyone with a Detroit engine should have is one wired between one of the glow plugs and ground so one can actually see what the...

Then that would be correct, 1 and 5

Looks like 1 and 5 But not sure that is the correct drawing, what model truck?