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Old 09-14-2016, 02:07 PM   #1
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Interesting problem

i have a 2008 American Tradition with a 425 cummings isl motor

When i turn the key off the engine keeps running
the dash air stops but all the gauges still work, it appears that the air is the only thing that stops all other things work just like the key was on

if i turn the switch off for the engine batteries then it all shuts down.
switch on and i can restart it but not turn it off.
does the ignition switch go to a relay somewhere?
i was thinking bad ignition switch but then why would dash air turn off you would think it would be all or nothing
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Old 09-14-2016, 06:42 PM   #2
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A few other members have reported similar issues .

Some have a failed diode in the alternator exciter wiring ; that allows power feed back to the engine ECM and the engine keeps running .

Another member had an internal problem with his dash radio , that allowed power to cross from the battery ( memory feed ) to the ignition feed.

You can disconnect the small wires at the alternator , to test for the diode issue.
Then pull the battery feed fuse for the radio , or disconnect it completely.
Hope one of these is your problem.
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Old 09-14-2016, 06:54 PM   #3
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Since a diesel doesn't rely on electric spark to run, the only thing that shuts it down is closing off the fuel supply, which is done with a solenoid valve. That's why shutting off the engine battery stops it - that solenoid loses power and closes.

An '06 Tradition should be on a Spartan chassis, so Spartan should be able to help you find the solenoid and the wiring from the ignition switch.
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Old 09-18-2016, 11:11 AM   #4
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Yep, the fuel shut down solenoid.

On my rig it is next to my fuel pump.
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Old 09-18-2016, 11:33 AM   #5
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Quote:
Originally Posted by deandec View Post
Yep, the fuel shut down solenoid.

On my rig it is next to my fuel pump.

Different years , different fuel systems , in 14 years of Dodge/Cummins repair at a dealership I dealt with 4 fuel injection systems , the first two systems used mechanical injectors and a fuel shut off solenoid, the third the VP-44 injector pump , with mechanical injectors, had an internal ( in the VP-44) electronic shut down. The forth system HPCR, uses electronic fuel injectors , and to shut the engine off the ECM simply stops firing the injectors.
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Old 11-11-2016, 11:58 AM   #6
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Well i have taken it to two different shops ( one a diesel repair the other a rv service) and no one can figure it out :(
i called the local shop that is listed under Spartan service and they just recommended that i take it to a rv place since its electrical.
so now i'm at a loss of what to do.

Something is back feeding voltage to the ignition switch.

There has got to be someone out here in california that can figure it out
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Old 11-11-2016, 04:30 PM   #7
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If it was the fuel shut off solenoid why does it shut down when all the power is shut off at the batteries?
I'm leaning toward the ignition switch. They can do some weird things.

good luck, keep us posted with the outcome.

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Old 11-12-2016, 08:45 AM   #8
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i called the local shop that is listed under Spartan service and they just recommended that i take it to a rv place since its electrical.
This sounds like BS to me , seems like they're afraid to get into, checking out the problem, then having to admit they don't know how to repair it.
The ignition switch will have multiple power paths , to activate systems that have different amperage load requirements , some of those power paths will activate remote relays to keep very high amperage loads ; like the air conditioning ; from over heating the switch.
To eliminate an internal problem in the ignition switch as a cause of the problem, all that has to be done is unplug the ignition switch multiple connector while the engine is running, if the engine stops , you have an ignition switch issue. A sticking ignition system relay or ; as I mentioned in a previous post alternator, or radio cross feed; are possibilities.
You may have to get chassis wiring schematics and start looking into possible cross feed items for yourself.
BTW; The member with the radio cross feed , keeping his engine running, had to locate the problem by himself.
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Old 11-12-2016, 08:51 AM   #9
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Don't know if this will help or not. On a Monaco in the run bay are a bunch of relays, maybe on your coach also. A bunch of intermittent start and run problems. RV tech tried several times and seemed to cure problem. Kept coming back. Started by replacing the ingnition relays, worked but came back. Fix was tweaking the contacts on each relay to insure contact on each relay.

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Old 11-12-2016, 08:55 AM   #10
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If it was the fuel shut off solenoid why does it shut down when all the power is shut off at the batteries?
pointrow

The Cummins fuel systems that used , fuel shut off solenoids , the solenoid was spring loaded to the off position, and so required power to allow fuel to the injector pump , disconnecting power at the solenoid or at the battery was the way to shut the engine down, when the ignition switch wouldn't.
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Old 11-12-2016, 09:06 AM   #11
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Quote:
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If it was the fuel shut off solenoid why does it shut down when all the power is shut off at the batteries?
pointrow
Because that's where the12V powerthat holds the "fuel shut off" OPEN comes from...(NO power = NO fuel = No run),
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Old 11-13-2016, 04:31 PM   #12
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engine keeps running

Your 08 ISL is an electronic engine.Its computer is fed from 2 fuses that go directly to the + battery.It is turned on by a feed from the ignition switch,likly thru a relay.Unhooking switch as suggested in an earlyer post is the place to start.My 04 phaeton has relay in the bottom of console,I dont know where yours is.Good luck,call spartan they should help you find it.Ronster old truck mechanic
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Old 12-05-2016, 01:13 PM   #13
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Well got it fixed
It ended up being a short near the tail light that was sending voltage back up to the ignition switch.
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Old 12-05-2016, 02:36 PM   #14
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Thanks for the update... How did you find it?

I had a tail light bulb that the 2 filaments were shorted internally, lot of head scratching to find it..
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