Alternator shorted out and speedo and tach quit

Tiny
WAYKOALA7
  • MEMBER
  • 2002 DODGE CARAVAN
  • 140 MILES
Put new alternator in, but speed and tach guages still do not work. Is there a module somewhere for these?
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Thursday, February 16th, 2012 AT 6:47 PM

3 Replies

Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
They aren't related to the alternator unless a fuse blew. The Engine Computer sends a digital signal to the Body Computer which interprets it and sends another digital signal to the instrument cluster which is a computer module itself. Typically if only one or two gauges don't work, it's a problem in the instrument cluster. If the gauges work but stay on "0", it can be a problem in any of those computers.

If the transmission shifts properly, you know the speed sensors, Engine Computer, and Transmission Computer are working properly.
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Thursday, February 16th, 2012 AT 7:38 PM
Tiny
WAYKOALA7
  • MEMBER
  • 3 POSTS
Good advise. From others on the internet, I figure it is the cluster circuit board. The u-pull bone yard sells them for $15, except they dont have a compatable caravan in the yard now
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Friday, February 17th, 2012 AT 7:08 AM
Tiny
CARADIODOC
  • MECHANIC
  • 34,330 POSTS
Where are you? There's a real nice chain of about two dozen very clean and well-organized yards called "Pull-A-Part" between Ohio and southern Georgia. I've been to 16 of them. A 2002 is a little new for them. On my last visit two years ago, the newest I saw was a '98 Caravan. You can do an internet search to check their inventory at each yard.
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Friday, February 17th, 2012 AT 10:12 AM

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