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Starting issues on a m923a1, looking for additional thoughts/suggestions

peecook

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Richmond VA
Truck has been running fine, no issues with the starter clicking or anything longer than 3 seconds for the truck to start, until a week ago. Here's a list of what I've done and what I plan to do on Monday evening. Any other suggestions would be appreciated.
Batteries are less than 2 months old.

* Verified batteries wired in series for 24v system, and checked clamp connections.
* Removed battery kill switch and extra battery cable.
* Checked main leads for 12v ( blower ) operation and main 24v supply leads to truck.
* Checked operation of other electrical systems on truck and found they had power.
* Checked main power feed to starter and found 24v.
* Checked ground cables from starter and engine block to frame and found good grounds.
* Checked to make sure neutral safety switch operating properly and found normal operation
* Checked for power going to aftermarket key assembly.
* Found key assembly operates a coil interrupting control wire to starter solenoid. Verified coil operates, drops 24v across the control side, 0v drop across the switch side.
* With battery switch on, and engine switch to start, found no power on solenoid control wire


Plan for Monday


Check for power to engine start switch
Check for continuity through switch when held in start position.
Check for continuity through protection box


To start truck without engine start switch, jumper 24v power from control side of coil to the switch side to engage starter.
 

thenext44

New member
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Location
United States
Doubt same problem but my no start problem was solved by replacing a ground wire coming off the lower solenoid inside the power control box. I replace the lower solenoid at same time since it was only $25
2.jpg1.JPG
 

peecook

New member
342
1
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Location
Richmond VA
I was hoping that it was the solenoid, since it sounds like an easier fix. But thinking through it now, the problem is pre solenoid, I'm not getting power to it on the control side.
 

Scar59

Active member
Steel Soldiers Supporter
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38
Location
Mt. Eden, KY
Doubt same problem but my no start problem was solved by replacing a ground wire coming off the lower solenoid inside the power control box. I replace the lower solenoid at same time since it was only $25
View attachment 518821View attachment 518820
Whats the part number of the replacement relay/solinoid you installed?
I have two PCBs needing replacements.
Thanks
 
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