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Old 09-14-2016, 02:07 PM   #1
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Join Date: May 2014
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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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Location: Powell River, B.C.
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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.

99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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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.
Gary Brinck
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL
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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.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs
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Old 09-18-2016, 11:33 AM   #5
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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.
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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