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Weird Electrical Problem

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Old 09-09-2012, 03:10 PM
JazzVT321 JazzVT321 is offline
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Weird Electrical Problem

I have a 2001 F25 with the 7.3L. Recently I've encountered some kind fo electrical problem. I think. When I bring my truck to a stop and put it in park the truck will rev the engine up to about 1300 or 1400 RPM for a few seconds then settle back down to idle. Also one time while stopped and in park the speedometer started jumping all over the place. I have a DP Tuner. The truck will do this when I have to tuner on and when I have the tuner off. I don't know where I need to start looking. Can someone point me in the right direction of where I need to look to fix this problem? I can answer any further question y'all might have. I recently replaced the speed sensor because it threw a code and was hoping that would fix the problem and it didn't. Thanks for your help.
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Old 09-09-2012, 05:18 PM
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id pull the chip first, see if problem exist.
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Old 09-09-2012, 05:59 PM
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Okay. Thanks. I'll try that. Anybody else ever experienced this?
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Old 09-09-2012, 06:00 PM
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Check the alternator output for voltage and amperage.
Check the batteries for voltage and amperage.
Get a digital volt meter that plugs into the cigar lighter or power point.
12V/24V Car Digital Battery Volt Meter - USD $ 6.99


An improper voltage can cause some of your symptoms.
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Old 04-06-2015, 07:58 AM
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Did you ever find the root cause of your problem? My truck did the same thing to me the other day.
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Old 04-13-2015, 07:34 AM
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I think my problem is linked somehow to the trailer brake controller. I leave my controller unplugged when not in use. I only have the symptoms when I plug my controller in, with or without a trailer. At this point it makes no sense to me.
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