montjim99 Posted February 2, 2012 Share Posted February 2, 2012 1993 legacy wagon. Brake light and battery light come on at same time and then go away and come back again seemingly randomly. I tested battery with engine off and it read 12.7 volts. With engine on, it read 14 volts, but periodically while idling, engine would make a light click noise and the voltage would quickly go down to 13 and quickly climb back up to 14. And when I turned engine off, voltage went back down to 12.7 but after only half a minute or so went to 18 and stayed there for roughly 10-20 minutes before returning to around 12.6. Any advice appreciated. Thanks. Quote Link to comment Share on other sites More sharing options...
johnceggleston Posted February 2, 2012 Share Posted February 2, 2012 sounds like the alternator may be going. check the battery cable connections, make sure they are clean. and then go to the parts store and have them test you alt. Quote Link to comment Share on other sites More sharing options...
ShawnW Posted February 2, 2012 Share Posted February 2, 2012 Have them test the battery too. Could be a bad cell or something moving around in the battery cells themselves. Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted February 2, 2012 Share Posted February 2, 2012 almost certainly a bad alternator. Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted February 2, 2012 Share Posted February 2, 2012 Check the nut that holds the cable on the alternator. Make sure it's tight. Also check battery terminals and the main engine ground. Quote Link to comment Share on other sites More sharing options...
porcupine73 Posted February 2, 2012 Share Posted February 2, 2012 If it went to 18 volts at any point that is not good, definitely sounds like something flaky going on with the alternator. The clicking noise, was that maybe the A/c cycling on and off? Quote Link to comment Share on other sites More sharing options...
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