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Old 07-28-2015, 03:46 PM   #1
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Diesel Coach Wouldn't Turn Off

We had been traveling all day and finally made it to our campground. After setting up, about 2 hours later, we were sitting in the RV watching TV when the TV turned off and the stairs retracted. The key was in the ignition but the ignition was in the "off" position. I turned the ignition on and started the engine (Cummins 360 diesel) and let it run for a couple minutes. I then turned the ignition off, but the engine kept running, and ran for over 1 1/2 hours before it shut down.

We went to bed and the next morning I got up and started the engine through the normal process and everything works perfectly.

What gives, any suggestions or help?
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Old 07-28-2015, 03:56 PM   #2
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Sounds like a bad ignition key switch. It is enabling power like when key is on, even when the key is in off position.
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Old 07-28-2015, 04:10 PM   #3
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It sounds like the solenoid for the run circuit got energized.
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Old 07-28-2015, 07:40 PM   #4
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Don't you have a kill switch in the engine compartment?

I vote for the ignition solenoid but think the contacts didn't disengage when the key was turned off.

If if should happen again, check the voltage across the coil leads of the ignition solenoid with the key off. If you don't get a voltage then check the voltage on the output side of the contact terminal. If you get voltage here then the contacts did not disengage and you need to replace the solenoid.

Another thing to try should it happen again is whack the solenoid with a heavy wrench and see if the engine shuts down. Not a sophisticated test but quick and dirty if the coil is not receiving power.

Same thing happened to me. After replacing the ignition solenoid all is well. I replaced mine with a Cole-Hersee 200 amp solenoid model 24213. Some may think this larger solenoid is over-kill but it has silver contacts and should be immune from sticking contacts. Think I paid about $40 for mine.
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Old 07-28-2015, 07:53 PM   #5
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A number of possibilities, that could be narrowed down if we knew what year the Cummins , the size,( ISC ? a number of Cummins with the 360 HP rating )and fuel system involved.
The 12 valve and 24 valve Cummins engines ran 4 or 5 different fuel systems and each has it's own shut down system.
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Old 07-28-2015, 10:18 PM   #6
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There's one very nasty "engine won't shut down issue with a diesel. If the bores are worn, the engine can suck up oil from the sump. This fuel source has no flow controls on it and the engine will run faster and faster until it flies apart.

It's not a common occurrence, but I know two people to whom it has happened. Mega $$$!
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Old 07-28-2015, 10:31 PM   #7
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Diesel runaway is not pretty.
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Old 07-29-2015, 07:56 AM   #8
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When I went to electrical school, they spent hours teaching common sense troubleshooting. He turned off the key. the steps went out and the TV came on when he pressed the button. That tells you he did NOT have power at the switch. The switch had turned off. Later the steps came in and the TV went off, just as if he had turned on the ignition switch. That tells you the ignition SYSTEM got powered up.
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Old 07-29-2015, 10:09 AM   #9
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Thanks for Comments

Technician responded to campground and tentatively identified the ignition switch as faulty. Seems as though this is not an uncommon problem for 2008 Monaco's.

Thanks for the help.......
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