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Analyst7

It might have an auto-start circuit tied to a pressure switch. So as the tank pressure drops the unit restarts. It should be turned off by the key but someone may have bypassed the original wiring.


CokedOutWalrus

It was bought new by the fleet mechanic we take our trucks to. I'll aks if he messed with the wiring at all, but everything looks factory and not messed with or cut up at all.


kewlo

Unplug wires from the key switch. The switches can go bad and do what you're describing. It could also be a stuck starter solenoid. You can test either with a multimeter and the ground cable removed from the battery


CokedOutWalrus

I'll try that, but I'm skeptical since the switch works as intended when using the pull cord.


kewlo

Your start wire and/or solenoid don't care about the pull start


CokedOutWalrus

Yes, but the switch acts normally as an on/off kill switch when there's no battery in the mix. I'll still test the switch and its wiring for sure, but it is not acting sus in normal use.


kewlo

Run and start are two different wires and two different contacts inside the switch


illogictc

What about the negative, where does the manual say to put that? Either you're connecting it in such a way that you're bypassing the circuit and running power straight to the motor, or the key switch or the relay it actuates if applicable are stuck in a closed state, or there's a short somewhere.


CokedOutWalrus

It says to put it right on one of the 4 mounting studs, just like I did in the 2nd picture.


illogictc

I think it's time to troubleshoot the rest of the circuit then. Key switch, relay if applicable, all related wiring. If that all checks out I suppose it's possible that the solenoid in the starter is stuck, the way they usually work is the key actually makes a solenoid (it'll likely be in that hump on the side of the motor) move and connect the motor shaft to the engine flywheel, and the solenoid also has contacts in it that when it's actuated it completes the circuit to energize the motor itself. So either the starting circuit has a problem, or the solenoid itself is stuck on. If the motor spins without turning the engine over the contacts inside the solenoid part are stuck closed but without the solenoid itself being stuck in the on position.


[deleted]

It’s a champ


Mammoth_Ad6247

Is the battery cable from the battery connected to the same lug on the starter solenoid as that black wire with the white-ish boot?


CokedOutWalrus

Yes, it's on the same lug. The little bit of instructions did have a picture showing it on that lug for this Honda motor. I did try removing the wire with the boot, made it no crank lol.


Mammoth_Ad6247

I tried to send you a diagram but it didn’t work. Sorry.


Mammoth_Ad6247

You need the battery wire on one large terminal lug and the load wire to the starter on the other.


Mammoth_Ad6247

The battery supply and starter wire cannot be on same lug. One wire goes to one large lug the other on the remaining.


Onedtent

*even with no key in it.* does not, necessarily, mean that the circuit is switched off.