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No starting issue
Should not be. Exciter wire has no power if he did it right- simp5782
- Post #17
- Forum: M939 series 5 ton trucks
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No starting issue
12.3v doesn't tell me anything it's a 24v system. What is the combined output voltage- simp5782
- Post #16
- Forum: M939 series 5 ton trucks
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No starting issue
If your batteries are fully charged and the starter is slow then the starter is bad. These are non gear reduction starters so they do pull a lot of power. I'll suspect a bad starter. Solenoids in the pcb are generally open or closed. Not just allowing some power thru- simp5782
- Post #10
- Forum: M939 series 5 ton trucks
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No starting issue
Battery switch will be bypassed by doing the large pin jump. Install a 10ga wire or bigger and leave it. Use a smaller jumper and jump from those bigger terminal to pin B. Wire tag 74. This will start the truck by doing this. Probably a bad starter. Solenoid is drawing yop much power- simp5782
- Post #8
- Forum: M939 series 5 ton trucks
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No starting issue
Remove pcb harness plug. Jump the 2 large pins. This bypasses the solenoids inside On a battery volts Is one thing. Amps Is another. They can show 12.3 but only have 400 amps rather than 850amps each. Use a load tester.- simp5782
- Post #3
- Forum: M939 series 5 ton trucks