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M51A2 dump truck start system wiring help.

DREDnot

Well-known member
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530
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Location
Phoenix, AZ
Just digging into a new to me non runner

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Has the LDS-465-1A multi fuel engine.
I spent the long weekend downloading ALL the TMs and going through them looking for the wiring diagrams.
I only found one and that was for the early gasser which doesnt match.
Mine seems to be a later 60s perhaps? It was last painted carc in 2003 so possible it had some later retrofitting like a larger primary fuel filter and who knows what.
We got it from BIA so who knows what "field expedients" were applied to it.
The start button is missing and may have been replaced with this abomination...

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It has what looks like a start relay but seems to be missing a voltage regulator

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It has an unknown condition fuel lift pump in the left tank but without a wiring diagram to look at I am not sure where it draws power from or when .



The truck is at a remote storage lot in 114 degree heat and I was hoping to be able to research and understand it before I get into the oven.

Mainly looking for schematics of the starter/relay/lift pump/battery(master)switch/voltage regulator relationship

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DREDnot

Well-known member
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530
93
Location
Phoenix, AZ
spent about an hour today before the heat got to me. Tracing some wiring.
It has a 60 amp generator fitted with built in regulator so that explains the missing regulator from the fire wall.

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The battery positive wire goes directly to the starter solenoid. A wire from the BATT stud goes up to the start relay box and another from the relay back down to the start lug of the solenoid. I dont see where the rest of the truck gets power from though.

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I got the battery switch accessible and saw some wiring issues before giving in to the elements

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Not sure what these two circuit breakers are for...

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DREDnot

Well-known member
777
530
93
Location
Phoenix, AZ
We had it transported by our go-to guy.

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We are just at the "get it running' stage right now.
Topping fluids, Trying to get power to crank and cleaning the fuel system
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