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I would suspect it is the sensor for the ECU. I just went to look for wire/connector info and discovered the A1 and A1R diagrams don’t show the engine temp sensor connection to the ECU… got wire numbers off that sensor and the one to the rear of the housing?

It is either a gauge temp sensor or a temp switch or an ECU coolant temp sensor. On the A0, they put a gauge sender on the rear side of the housing(upper port), off of a T that circulates coolant to the expansion tank. The heater feed is the lower port, both can be seen upper left in your...

That wire to the AC terminal on the reg feeds RPM info to a LBCD, which the A0.5s dont have(no LBCD, remote or manual battery disconects)... so no youvare not missing anything if you dont have a LBCD...

What causes sulfation: when you draw electrons out of a battery the plates obsorb sulphur ions from the electrolyte. The deeper the discharge the more sulphur is absorbed. When you add electrons to a battery it pushes the sulfur back into solution. When the plates hold sulphur too long it...

I have seen some of the solargizer panels installed on top of the Air op hydraulic pump or air filter as they are not that large. Plenty of room up on the roof of the cab...

Here: https://www.steelsoldiers.com/threads/fmtva1-electrical-schematics.158229/

There is a set here under present conflict vehicles. It is just the schematic and located near the A0 manuals...

Yep, battery tester. On wet cell batteries, you removed the caps on the compartments/cells and inserted it to measure the electrolyte level. If the tip contacted electrolyte, the led would light indicating the cell was sufficiently full of electrolyte… unusable on sealed batteries…

You only need one balancer, even with 4 batteries, as the two series strings are wired in parallel, and parallel batteries are already hardwired to balance:) a single balance will balance the 0-12 to the 12-24 batteries(or vis versa). But you still need a source of power to replace that lost...

No, the 1 and 2 indicate battery 1(gnd to 12v) and battery 2(12v-24v). In your pic the outermost batts are grnd-12v(batt 1 in my diag). The innermost are 12-24v (batt 2). The connections near frame are 24v. One to the starter, one to the 24v batt term on the polarity box and one to the nato...

Here, I condensed the important bits out of the mil schematics for the A0 start circuit. you will need this eventually, everybody does:)

Drop to two batteries, your very expensive alt will thank you. The truck doesn’t need 4, and the alternator is really undersized in the dual volt configuration to charge them properly. CB79 feeds 24v IGN power to the TCU. Yours could be either wtec2 or 3 TCU. A 2 has a wider green LED...

No trans display, no neutral start circuit. As mentioned clean the polarity box connections and shunt connections between spare and air filter. CB 79 should power the trans controller, but it also gets 12v from another breaker(will have to.look it up). Ypu need those to power the trans which...

The rad can pull in a lot of air down below on either side. Here is a pic of the .mil version, like a diaper that bridges and seals that space between intercooler and rad. kind of a pain to install from what I understand… i was thinking a set of tracks on either side of the rad face so I...

Yea a large chunk of the lmtv radiator air comes up from the lower bumper area...

Yea, whats it look like installed/where does it set?

What general said. S5 connects it to sensor - on the ECU…

So have you ordered your 24v alt and 24-12V converter yet? Now is the time to convert:)

Not quite. That 100AH rating was for a 20 hour discharge rate(they do other ratings like 5 and 10 hours, but a 20 hour rate is the norm), so for a 100AH battery that is a 5A Load. As you increase the load above that 20 hour rate, the battery drops in efficiency. Basically the added current...

Ok, so my first description was correct. When you push in the park control you send park air thru a 2way(behind drivers grill) and on to the anti-compounding valve that in turn sends air to compress the park springs/release the park brakes. Watch that video I linked to and you will get an...