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It's supposed to be inside the battery disconnect box. Do you have a battery disconnect box? A0 trucks did not have them.

That's a typo in the schematic I assume. Or maybe it was an early acronym for Load Sensing/System(?) Control Device or some such. Either way it's the same part and now referred to as the Load Battery Control Device. See the diodes inside it? Sounds to me like you have a 24v supply wired to the...

Not familiar with this "LSDC" - can you show this to me on the schematic? Are you sure you don't mean LBCD (Load Battery Control Device)? If so that's not a voltage regulator...... the dual voltages come from tapping the center of the battery bank for 12v and the full battery bank for 24v so if...

That truck wouldn't have the air lines because it didn't originally have the C7. The air lines to the MMDC are not part of the electrical harness so probably haven't yet been added. They originate from a T off the primary and secondary air brake supply lines going into the pedal valve. The T has...

Yeah that looks like the right one and about the right price. I show the price to the government in 2020 was $760.94 from Medallion Instrumentation Systems LLC. Part numbers: 12423156, 12423256-001, 7020-20032-01, 7020-20044-01 NSN: 5895-01-591-7887 There is an updated box called out for...

Beware the MMDC's you see on ebay - most are for boats and don't have the correct programming nor the air tank transducer fittings. I've scored a few for spares and all of them have had one or both of the pressure transducers inoperative just like my original so I sourced replacement transducers...

There are two termination resistors - one is near the engine ECM, and the other is below the dash on the passenger side. They are 3-pin Deutsch termination resistor connectors: https://mypartsuniverse.com/products/deutsch-dt06-3s-p006-dt3-resistor-f The idiot light panel runs off the MMDC...

Model's are A1(R) and A1P2 - actually the military doesn't officially recognize the "A1R" - it's just a late model A1 in terms of the EMS-NG system - but some documentation including PS Magazine articles and some of the schematics mention it so it's kinda stuck. A1P2 is the "phase 2" which are...

Well that appears to be the original 1997 MD3070 transmission - which was originally either a WTEC II or III. The transmission control module and the shift selector is for the WTEC-IV 3700SP transmission used in the A1R trucks starting with transmission serial 6510653277 and later. The two...

The crank circuit will not operate till the transmission controller powers up and engage the neutral start circuit (confirming the transmission is in neutral and it is safe to start) that allows the PDP circuits to pass power to the starter solenoids. My guess is they couldn't figure out this...

I find it unlikely that a qualified Reserve technician can't figure out the schematics for the various models in question. It's all readily available in EMS-NG on his MSD3 or MSD4. I find it more likely that he doesn't know what to do with this information in terms of how to adapt the C7 to the...