Marcus_phillips Posted January 9, 2015 Share Posted January 9, 2015 Okay, my wife's Ford Focus lit up like a xmas tree last week (no jokes please) now I know this is a low battery fault. Now to cut a long story short I have wired a digital ammeter inside the car to see the voltages coming from the alternator. At Idle just over 13v at 2500rpm and over 13.9v, now for the problem, when I use the side lights it drops by approx. 0.2v, but when I put the heater fan onto number 1 the voltmeter shows 12.3v, in effect the alternator not charging. There is no light on on the dash and when I turn the heater off after around 10 secs it starts to charge again (13.9v). Any ideas? sounds like a dicky alternator but not sure any help. Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted January 15, 2015 Share Posted January 15, 2015 Alternator is certainly suspicious, however the heater is a high output item. IIRC, putting heat on with the heated windscreens the car should be running at around 13v at least.... Quote Link to comment Share on other sites More sharing options...
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