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Could be the starter. Have you *tested* the batteries that you charged? What is their voltage and have you done an actual load test? 12v is dead. 12.6v is fully charged. Many people have trouble with this. I've been bitten myself by this. Even a battery that reads 12.6v can still be bad. Only an...

Pull your batteries and full charge them out of the truck. :rolleyes: While that is happening in the background. Clean EVERY ground on the truck. Especially the ones from the battery box to the frame, the frame to the alternator, the frame to the cab (just replace it), and the frame to the...

The oil pump is shot. I would stop running it under load till you get the oil pump replaced. The pumps were redesigned by CAT several times and the relief valves on the pump are weak in addition to changing from a gear pump to a trochoid (gerotor) pump and the idler gear bushings/bearings...

How many miles and how often do you drive it? What's your oil pressure and have you checked out the HEUI injection actuation pressure stability? What are you ultimately planning to do with the truck? For most of us, ECO hubs are a very good idea for drivetrain longevity.

It's just a 24v, 100A continuous duty solenoid. Any brand/country of origin you are willing to live with will work in theory. Google some up, note down some part numbers, and start calling suppliers in your area. Factory is a Prestolite..... NSN 2920-01-361-5802 Part #'s 12414619 BAE 19999220...

Don't worry about simplifying till you address the early HEUI system, superceded engine oil pump, and cleaning/servicing every electrical connection and everything rubber on the entire truck. Beyond that - there are many threads on how to remove the LBCD, change over to a commercial alternator...

The Bendix AD9 is cheaper with many Chinese knock offs on the market as well. It has a lower SCFM rating, and only a single desiccant type. Servicing it will require removing if from the truck and is at least a 45 minute to 1 hour job. The PURest dryer has a five stage desiccant cartridge, has...

Get one of these - they are surplus units that are brand new but were sent to surplus due to having the older 150 psi relief valve. These come with the mounting bracket that matches the holes in your frame. It's a super easy swap...

Head rebuild kit is a Haldex RNT26 https://www.finditparts.com/products/370307/haldex-rnt26

You have a picture? The oil line parts are all just off the shelf AN hardware AFAIK.

Yep. With these trucks you MUST re-do every ground point if you don't want to be chasing electrical gremlins forever. And while you're at that clean all the power connections as well. #1 task for a new FMTV owner IMO is to spend a week addressing every electrical connection and checking/changing...

You should at least rebuild the compressor cylinder head. Without exception, EVERY SINGLE ONE of these FMTV Haldex compressors I have opened up has broken exhaust valve springs. I came to this realization when the disc in one of my exhaust valves broke in half and slipped down into the cylinder...

It's next to the piston return springs, the muffler bearings, and the spare Jesus nuts (always carry a spare). I find that you can also substitute turbo encabulator fluid - which is chemically compatible with all blinker applications it's just more highly refined and you can dramatically...

Won't hurt the relays but doesn't prove the contacts inside them are any good. Just indicates they are being triggered to close (open for the NC contacts). Make sure you have 5 pin relays where you need them, and 4 pin relays only in locations that don't have the NC contact (87A) populated in...

What you are hearing under the PDP when you shut off the truck is the fan solenoid de-energizing and dumping the air from the pneumatic line that disengages the fan clutch. The CTIS you will hear after you power on the truck assuming there is enough air in the wet tank to open the brake...

Is the transmission display lit up and does it show N? If the trans computer doesn't power up and go to N it will not enable to starter via the relays it controls.

Could be bits of deteriorated old fuel lines maybe? From the inner lining? Good thing you replaced them. I haven't run across anything that looked like that in the fuel system on these trucks. Maybe someone used some gasket maker on the fuel filter gasket?

I wrenched on M35's in the Motorpool and was universally ALWAYS required to drive the damn things due to a perpetual lack of enough soldiers that knew how to drive a manual transmission. Well acquainted with those turds as well as 800 and 900 series trucks. The LMTV's are not over-complicated...

That's wild! I haven't seen that before. I imagine soldiers did something stupid to cause that. Ran into the cab with another truck while it was lifted perhaps? I'm not seeing how that could happen with the cab in the down position. I can only guess that the cab was lifted while the truck was...

That's awesome. And useful. And speaks to the actuators ability to lift relatively lightweight objects for an application that doesn't already have a tested and implemented and simpler solution. I don't see the value in re-designing the tire carrier unless you are going to move the tire to gain...