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Old 11-16-2007, 06:51 AM
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Blown Fuse/No Throttle/No Gauges

Hi All,

Really need some help here. I have a 2002 F-350 Single Wheel with the 7.3L. Several weeks ago on the way home the truck gauges died and throttle response stopped. After some fuse checking I found that the fuse which controls the dash/TPS at the pedal/etc. had blown. I believe this was number 45 on the diagram.

Having replaced the fuse I started looking for the culprit. I read some post on here about bad TPS at the pedal so my buddy and I hooked up this cool computer that graphs amperage draw to the TPS. We never saw a spike above 3amps after driving around for an hour.

I also saw some posts about chaffed wire harnesses near the left front shock tower. After a pretty good inspection, I can't see anywhere this has happened.

I also spoke to the heavy equipment manager at my Ford dealer about the TPS. According to him, he has never seen one go out on a 7.3L truck. Mine only has ~74,000 miles.

Do any of you have any idea what I should look at next?

Any help would be greatly appreciated!

Thanks!
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Old 11-16-2007, 07:25 AM
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Quote:
Originally Posted by John Dalton View Post
Hi All,

Really need some help here. I have a 2002 F-350 Single Wheel with the 7.3L. Several weeks ago on the way home the truck gauges died and throttle response stopped. After some fuse checking I found that the fuse which controls the dash/TPS at the pedal/etc. had blown. I believe this was number 45 on the diagram.

Having replaced the fuse I started looking for the culprit. I read some post on here about bad TPS at the pedal so my buddy and I hooked up this cool computer that graphs amperage draw to the TPS. We never saw a spike above 3amps after driving around for an hour.

I also saw some posts about chaffed wire harnesses near the left front shock tower. After a pretty good inspection, I can't see anywhere this has happened.

I also spoke to the heavy equipment manager at my Ford dealer about the TPS. According to him, he has never seen one go out on a 7.3L truck. Mine only has ~74,000 miles.

Do any of you have any idea what I should look at next?

Any help would be greatly appreciated!

Thanks!
take the plastic covers off of the steering column....it will be the wires that come out of the shift handle for the overdrive button that will be chaffed on top of the steering column...tape them if you can and if they are too bad replace the shift handle....
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Old 11-16-2007, 10:22 AM
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Marc, thanks! I will do that tonight. Do I need to remove the ignition to check this?
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Old 11-16-2007, 12:09 PM
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yes...but its easy. take the bottom plastic off.....then turn the key to run and push the button through the hole under the cylender and just pull it out....
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Old 11-16-2007, 12:10 PM
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Thanks Marc!
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Old 11-19-2007, 06:05 AM
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Marc,

That was exactly the problem. The small red/white wire had a tiny chaffe where it went around the mount for the shifter assembly. Took a few minutes to get everything off to fix the wire but, not too bad of a fix.

Thanks very much for your help! You saved me a lot of time and I am sure quite a bit of money I would have spent at the dealer.

Have a great Thanksgiving!
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