Question about 1989 Volkswagen Cabriolet

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Tach,temp gauge,gas gauge intermitantly works

The tach,temp gauge and gas gauge stop working intermitantly. They will just stop working and the battery starts to discharge. I have had the alternator checked and it was good. They will start to work just as quickly as they stopped. I have replace the insturment voltage chip on the insturment cluster but it did not fix it.

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  • ianrainey Apr 01, 2009

    I have the same problem. My 1991 Etienne Aigner Cabriolet is doing the same thing. Only problem is that when the tach, temp and warning light go off, then my alternator drops, and my car battery dies soon afterward. Did you ever find where the electrical fault was?

  • Anonymous Mar 25, 2014

    My instrument cluster has intermittent problems. The gauges stop working, speedometer, tach stops, indicator light comes on. All fluxuate on an off. I've changed the instrument cluster and it worked for 4 days. Then problem started all over again. Checked the alternator and batter, both are good.

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This problem can be tricky to solve... one thing I have run across is that some Cabrios have a factory fault that lets water leak though the firewall onto the fusebox! Needless to say this will cause any number of electrical problems due to the inevitable corrosion. The problem is fixed by inspecting under the hood directly above the fusebox (where the computer is mounted) Look for signs of debris or moisture. I have successfully repaired these with a good cleaning and the application of an asphalt based waterproofing membrane (unfortunately this was too late in some cases and neccesitated fusebox replacement!) Hope this helps... ;-)

Posted on Apr 13, 2009

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