pcm fuse blowing

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Mar 25, 2008 | 10:09 PM

Bossco

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pcm fuse blowing

I have been blowing the same fuse for a few weeks now. This is a work truck that I don't drive, so I don't know if it when they hit a bump or turn or what. I am thinking it could be in the steering column. Maybe they are adjusting the wheel height and it goes. You know employees....no help. It seems like it will go for days, even weeks without a problem. Then it will blow 2-3 times in the same day. Not sure of the number fuse, but it is the pcm. My accelerator and guages go out. Dealer has had it twice but can't find the problem. They replaced the whole fuse block because of a leaking windshield.

900 later it is still blowing the fuse. I know you guys can help. Thanks

Mar 25, 2008 | 10:18 PM

John311t

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D/C the fuel heater inside the fuel bowl. It could have burned out and keeps blowing the fuse.

Mar 25, 2008 | 10:22 PM

bfife

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From: Twin Falls Idaho

A liitle more info would help. model,cab style.auto/manual. I know when I installed a console in my truck, I accidentally ran a screw through the wiring harness that runs across the floor of the cab. blew the fuse that powered the whole instrument cluster. check for any aftermarket installs. flashlight mounted to the floor etc.

Mar 25, 2008 | 10:30 PM

bdrummonds

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From: Millbrook Alabama

Bossco, you may be on to something with the thinking of the chaffed steering column wire, but, next time it blows let us know what number fuse it is.

John is on to something with the fuelbowl heater shorting, but that will kill the truck, and wont let it restart. is your doing this?

Mar 25, 2008 | 10:33 PM

PaysonPSD

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From: Payson, AZ

Here's the back of the fuel bowl. Remove fuel heater connection. If fuse holds then the fuel heater has shorted out.

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Mar 26, 2008 | 05:05 AM

Bossco

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First off.....thank you for responding so fast. Posted the question before bed last night, woke up this morning and already have answers. You guys are amazing. Okay. Tried the fuel bowl plug. The fuse still blew. The truck is not dying, I just lose the accelerator and all the guages. It is a 20 amp fuse, again, I don't know the fuse number. There has been no alterations done as of lately. This just started happening out of the blue. The truck is a 99 F450 reg cab with buckets and a center console. Dump bed. 4 wheel drive auto....diesel. I think thats it. I can't believe I didn't put that in the original post. Maybe I should have the dealer try adjusting the wheel tilt and see if it blows. They have isolated everything on that circuit and found nothing wrong....maybe moving the steering wheel will cause it again. Keep the ideas coming......and thank you.