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Ok, of all the messed up things I have seen people do to diesel fuel systems, not understanding fully how they work, I am finally able to say this isn’t so bad… the pump looks like it has adequate flow(100-165GPH?) usually what I see is someone throwing one of those autozone inline diesel...

So what are we looking at here? I recognize the hydraulic pump:) what model fuel pump is that?

What was it?

The oil pressure gauge and gauge sensor is not related to the start circuit in any way… the only thing they have in common is they both sample engine oil pressure… There is a separate oil pressure switch that is plumbed into the oil system on the lower drivers side of the engine block near...

Well if you hooked the batteries up wrong, either nothing will happen because the polarity box will prevent flow, or things will get really hot. If a good battery was dropping to 3V because of load, something would be getting really hot. Sounds like a bad battery. Are they charged and do they...

Yea need more info… i don’t understand the other pump either, how is it plumbed, how is it controlled. The fuel system moves a lot of fuel and must run at specific pressures. Modifications done incorrectly can restrict fuel and KILL the MUI injectors…

You only really need 2. The milspec for the LMTV battery bank was gross overkill. Caterpillar specs a pair of group 31’s for equipment using the 3116/3126 engine (100AH, 1000CCA). The 4pack of 6TL’s originally specced(240AH) is way oversized for the alternator installed and is probably why...