nate_o23
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Well I have a problem with our M939A1. It has gone through 3 generators in the past month.The first generator caught fire and even melted the wires. We fixed the wires and put on another gen. That Gen just went out, so I changed it again. When I fired it up and put a load on it (A/C and lights on) I found that I am getting 27.5V at the gen but only 25.5V at the battery. The gen also is getting very hot after only a few minutes of running. I didn't think this was right so I fired up a different 5Ton to double check.I turned the A/C and lights on, and after several minutes the gen was still cool to the touch. Something is definitly not right with our 5 ton so I did some more checking.
OK so here is what I have checked so far.
Main wire from gen to PCB= .1 ohms, wire from PCB to starter lug= .1ohms, starter lug to batteries= .1ohms
Neg wire from gen to ground= .1ohms
changed PCB
wire #568(I think) = battery voltage. I think this is the wire that powers the windings.
wire #566(I think) this is the one wire Im not sure of. According to the schematic it goes to the PCB but Im not sure what it does.
I have checked all the connections between the gen. and the batteries and everythng is tight and corrosion free. I just dont get why I am losing voltage between the gen and batteries.
So does any one have any ideas?? Something is causing the generators to heat up while running which Im sure is what is making them go bad. The question is what is causing this?? Any help would be GREATLY appreciated!
OK so here is what I have checked so far.
Main wire from gen to PCB= .1 ohms, wire from PCB to starter lug= .1ohms, starter lug to batteries= .1ohms
Neg wire from gen to ground= .1ohms
changed PCB
wire #568(I think) = battery voltage. I think this is the wire that powers the windings.
wire #566(I think) this is the one wire Im not sure of. According to the schematic it goes to the PCB but Im not sure what it does.
I have checked all the connections between the gen. and the batteries and everythng is tight and corrosion free. I just dont get why I am losing voltage between the gen and batteries.
So does any one have any ideas?? Something is causing the generators to heat up while running which Im sure is what is making them go bad. The question is what is causing this?? Any help would be GREATLY appreciated!