Question about 1992 Volkswagen Passat
To get an accurate voltage reading on the alternator, measure across the battery while the engine is running at 3000RPM. It should read between 13.5 and 14.5. If it's low then shut the car off and look on the back of the alternator for a large red wire ( it should be on a terminal marked B+) and make sure the terminal is clean and shiny with no trace of green gunk (corrosion). Clean up the small blue wire too. Do the same with both battery cables. Check the tension on the drive belt. It should only move about 1/2 inch when you push down on it. Retest for voltage. If it's still low then you have probably damaged the alternator when you unhooked the battery. NEVER unhook the battery cables on a VW when it's running. Hope this helps.
Posted on Nov 15, 2010
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Posted on Jan 02, 2017
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