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Old 04-23-2011, 03:08 PM   eBay Motors  #1 (permalink)
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electrical problem! need help asap! guages going crazy

well normally id just start going to town with a volt meter but im 200 miles from home at my sisters for easter. my whole instrument panel is going crazy. it will go from being normal to brake, abs, flashers, battery light go on and all the other guages die out. 2 seconds later it will come back and then go crazy again. im thinking its got to be shorting out somewhere. anyone had a simila problem? i had one big fuse that was blown (40amp, stud#1) under the hood. i really dont want to get stuck here and have to take it to the dealer on monday to get it figured out.
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Old 04-23-2011, 05:12 PM   eBay Motors  #2 (permalink)
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First that fuse is for the power to the tow cable plug-- leave that out for now-! It is only to power and charge if there is a trailer in tow.

Check the ground cable at the frame under the driver's seat. Clean it and make sure it is secured good.

Does it work OK with the light off-? If so- could be a short in the trailer plug-- or the cable that is behind the driver side-- on top of the gas tank-- (That is for a 5th wheel plug if the person wants to add one.)
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Old 04-23-2011, 05:37 PM   eBay Motors  #3 (permalink)
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well i just replaced that fuse. i think its the instrument cluster. i did some searching and that looks like what it probably is. its on the cluster, rest of the pickup runs fine, not a frame ground issue.
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Old 04-23-2011, 06:21 PM   eBay Motors  #4 (permalink)
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unhook to batteries for a little while and hook them back up? That took care of my security issue I had a few weeks back.
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Old 04-25-2011, 06:26 PM   eBay Motors  #5 (permalink)
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This almost sounds like the problem that im having, Did you figure it out? In the colder weather it looks like the glow plugs are drawing way to much, alternator gauge goes from 13v to around 17 to 18 volts as it surges up the service air bag lite flashes across the dash, change fuel filter, change oil filter, headlites and dash lites flash like strobe lites. it all stops once the truck warms up a little and the alternator gauge stops pulsing. Its fun in the dark driving down the road with the headlites flashing people actually pull over and let me by. Oh and on a side note if the truck is plugged in and the block kept warm this does not happen.
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Old 04-25-2011, 06:29 PM   eBay Motors  #6 (permalink)
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Forgot to add everytime I bring it to the dealer they cant duplicate it, they checked the charging system and the batteries found nothing.
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Old 05-01-2011, 07:53 PM   eBay Motors  #7 (permalink)
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mine was doing some crazy s@#$ gauges going crazy, no blinkers, but brake lights worked... wouldnt start sometimes. Ended up being the ignition housing.
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Old 05-02-2011, 08:47 AM   eBay Motors  #8 (permalink)
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How old are your batteries? Mine did the same thing a few years back and it was the batteries. even though they tested fine, put in a fresh set and problem solved.
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Old 05-08-2011, 03:15 PM   eBay Motors  #9 (permalink)
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I was having a similar problem where the gauges would go off completely, then come back on. I removed the bezel, then the gauge cluster, and pulled and re-inserted the plug and now it's working OK. Don't know how long the "fix" will last but it was a lot cheaper than replacing the whole cluster. My local Mech. quoted $600 to do the cluster replacement and couldn't guarantee my miles would be correct unless I could get it to work just before he replaced it. Now that I know how to pull the cluster I could do the replacement myself but the rebuilt cluster vendors tell you how to get the mileage right.

This whole cluster failure problem cries out for a group lawsuit on GM. When the cluster fails, you don't know how much fuel you have, how fast you're going......nothing! It's a real safety problem. I went to the dealer on mine and they seemed clueless......asked me if I checked the fuse. It's not the fuse!
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Old 05-13-2011, 07:03 PM   eBay Motors  #10 (permalink)
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I'm having the same issue with my truck! Its an 03 sierra 6.6L Duramax. This problem has been on going for a good year at least. My speedo has been dysfunctional for a year or so. I have been using my Kenwood in-dash DVD player with Garmin GPS for the speed. Basically, I put my key in the ignition and the whole dash cluster goes nuts. All the gauges (minus the broken speedometer) spike high to low. Sometimes the odometer/message center will work, but not display the correct mileage when it does work. My main battery was dead today. I noticed that the odometer display was still on when I turned the truck off; it was just a few bars of color on the display. I really haven't checked any of the fuses or anything yet.

Timespentsearching, is this problem similar to yours?

And anybody have any recommendations?
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