M925 won't start with switch

[Csm Davis]

Checked switch, good.
Checked protective control box, good.
Truck will run if starter is jumped, will shut down if ignition switch is flipped off. At a loss to what is wrong.

 

[NDT]

I forgot, does that truck have a neutral safety switch that could be stuck?

 

[Csm Davis]

I forgot, does that truck have a neutral safety switch that could be stuck?

Yes it does going to double check it today. Thanks

 

[juanprado]

maybe run through shifter and make sure it is truly in neutral.

 

[Csm Davis]

Can back feed from fuel solenoid and it will start with the switch. Changed the protective control box with known good one , ignition switch with good one and jumped the neutral safety switch and it still will not start normally. No clue at this point.

 

[Csm Davis]

Okay may have found something the Schematics list a neutral start switch and a neutral safety switch. Where is the neutral start switch? Neutral safety is in the shifter.

 

[Csm Davis]

Ran jumper from horn to fuel shut-off solenoid. This allows it to start normally but has to be shut-off by emergency kill handle or unplug jumper wire and flip ignition switch.

 

[Csm Davis]

Well I guess I will have to put a tone generator on the wires to figure out what is going on.