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I have a 1989 Wrangler YJ and the voltage regulator guage does not work. Any ideas on where I should start to try to fix it. Thank you
 

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Wranglers have been know to have problems with corrosion in the guage cluster. It is really easy to pull the dash apart and inspect the connections. There is a thin plastic sheet with the copper wires running through it. Check the connections to the wiring harness and pull the connectors on the guage side too. I found the corrosion on the guage side on mine. A little corrosion is all it takes. I used sand paper to clean it up. Let us know if this helps.
 
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