7.3 won't shut off - Ford Powerstroke Diesel Forum
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post #1 of 2 Old 02-12-2014, 12:41 PM Thread Starter
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7.3 won't shut off

2003 7.3 won't shut off when key is removed. Disconnected all 4 battery terminals still won't shut off. Had to remove 10 mm bolt holding wire harness to drivers side engine block to shut off. Need ideas to what the cause is?


03 Lariat supercab shortbox 7.3 F250
6 in lift, 35's on 18in Fuels, TW tunes, glowshift gauges
AFE stage II intake, 4in turbo back exhaust, 7in tip
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post #2 of 2 Old 02-12-2014, 02:21 PM
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I would be thinking Ign Sw. Does the dash stuff go off? (gauges & lights in the cluster?)

If not the batteries are going to be drained and I think, for now, disconnecting the batteries is a good idea (just 2 Neg will do )

To stop the engine alone, I would just pull Relay 303 (IDM in an '03) from the in-cab fusebox.....
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