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Old 12-03-2012, 07:12 PM   #1
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Speedometer & Idiot Lights

2005 Alpine Coach, 400 HP Cummins

I was just driving down the highway and the speedometer went to zero and all the idiot lights came on. Then the speedometer went back to speed and the idiot lights went off and everything seemed normal.
What the heck just happened?
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Old 12-03-2012, 08:41 PM   #2
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Brain fart.
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Old 12-04-2012, 09:53 AM   #3
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Brain Fart works for me!
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Old 12-04-2012, 09:59 AM   #4
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Sounds like the ECM may have lost power for just a split second. Did you feel any loss in momentum? I would suggest checking and tightening any Grounds you can get at.
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Old 12-04-2012, 03:02 PM   #5
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Had the same thing happen. It turned out to be a missing bolt that holds the HWH Equipment in the bay. This bolt is a major ground point. Never had the problem again
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Old 12-05-2012, 10:16 AM   #6
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Yea, that's the first place I would check for a speedo problem... the HWH bay. If only we had more common sense like that, then it wouldn't take so long to troubleshoot!
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Old 12-05-2012, 10:51 AM   #7
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Family Man

For your information the bolt I refer to is a major ground point on coaches equipped with Vansco, which your coach does not have. The problem described is consistent with a loose ground as was mine.
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Old 12-06-2012, 10:18 AM   #8
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Hey, TinyTom
My 2005 Alpine DOES have Vansco.
I'll look for that ground - Thanks
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Old 12-06-2012, 10:39 AM   #9
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Tjshively

The bolt I am refering to secures the HWH unit in the HWH bay. It bolts up through the bottom of the coach. If your HWH unit is not loose in the bay its probley ok but I would check to make sure it is tight. Sure caused me one heck of alot of problems.
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Old 12-30-2012, 10:32 PM   #10
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FWIW, I had a recurrent tach problem - tach would flick up to maximum (thus kicking off the speed control), then return to normal. Might continue that way for dozens of miles, then cure itself. One day I crawled under the trannie and unplugged and re-made a couple of electrical connections. Problem solved. So in that case it was a dirty connection.
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Old 01-04-2013, 11:20 PM   #11
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Quote:
Originally Posted by tinytom View Post
Family Man

For your information the bolt I refer to is a major ground point on coaches equipped with Vansco, which your coach does not have. The problem described is consistent with a loose ground as was mine.
Not accusing of bad advice. Joking that a speedo issue would lead into the HWH bay...
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