No instruments, won't shut off

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Mar 20, 2021 | 03:50 PM

Chad LaChapelle

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No instruments, won't shut off

99 f350... no instruments and will not turn off by key... have to pull fuse to stop..

Have swapped out GEM and ignition and no change. Any ideas?

Mar 20, 2021 | 06:15 PM

dn29626

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From: South Carolina

Pulling that fuse is the kill.

Mar 21, 2021 | 04:36 AM

aawlberninf350

It's a Van Gogh

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From: Elk Grove, CA

Fuse 16 should be Trailer battery charge on your model year, not related to your issue.

Which fuse did you pull to kill the engine?

Mar 21, 2021 | 06:04 AM

Chad LaChapelle

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Quote:

Originally Posted by aawlberninf350

Fuse 16 should be Trailer battery charge on your model year, not related to your issue.

Which fuse did you pull to kill the engine?

My mistake, fuse 16 in cabin says instruments but apparently only gets power when high beam on.. i pulled a large fuse in engine bay for the idm to kill engine. Cannot remember the number (26 or 27 ) as have done it so many times now.. have been chasing this issue for a long time... simply hoping for new ideas

Mar 24, 2021 | 03:45 PM

Chad LaChapelle

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Anyone have any ideas ?

Mar 25, 2021 | 12:23 AM

aawlberninf350

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From: Elk Grove, CA

Fuse 29 (5A) is also instrument cluster, replace that and see if it helps.

Diagrams below.

Still stumped on the not turning off issue.

Attached Images

7.3 Power distribution 1.pdf (1.14 MB, 16 views)

7.3 Power distribution 2.pdf (1.12 MB, 28 views)

7.3 Power distribution 3.pdf (869.1 KB, 13 views)

7.3 Power distribution 4.pdf (925.9 KB, 19 views)

1999 7.3 diesel owner's manual.pdf (1.53 MB, 17 views)

Mar 25, 2021 | 08:00 AM

SkySkiJason

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Joined: Jul 2008

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From: N.GA Mountains

Check ignition switch on steering column.

Not turning off means something is staying hot/12v that should not be. In the pin outs for switch, you’ll find wires that are only supposed to be hot with ignition switch turned to ON/RUN. We use one of these for ‘after run’ for turbo timer and ‘purge cycle’ for vegetable oil conversions.

Have you removed cluster to see if it’s plugged in good?

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Mar 26, 2021 | 02:09 AM

Chad LaChapelle

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Quote:

Originally Posted by FordTruckNoob

Check your grounds. Weird fuses getting pulled to stop an engine sounds like power is getting backfed through circuits.

am pulling big fuse 27 for.idm in engine bay to kill engine. Otherwise 30 in cabin kills it too. all fuses are good and never blowm ever. This.all.just started happening all of a sudden...
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