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Old 08-11-2005, 16:59   #1 (permalink)
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Question Alternator problems on XF

I've got another problem with the alternator on the old girl. During a cold morning (like the ones we've had in Melbourne these past few days), it'll start up fine, fast idle for a bit and then drop to normal idle. I press on the brake pedal to disengage the handbrake and the voltage gauge drops to halfway between middle and bottom red zone (Ghia digital cluster). I let go of the pedal and it still stays at that level. I pump the pedal a few times and it goes back up again to one bar above middle, where it normally is. It stays like that for the rest of my trip.

As I see it, a voltage drop like that could only mean the alternator isn't working right (busted regulator, bushes) but pumping the brake pedal could indicate a short somewhere. Any ideas?
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Old 08-19-2005, 15:02   #2 (permalink)
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Re: Alternator problems on XF

confirm it with a multimeter
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Old 08-20-2005, 17:42   #3 (permalink)
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Re: Alternator problems on XF

Once you press the brake pedal the first time and the voltage drops, will it come back up by slightly reving the motor?

If this is the case then that is normal as those alternators have an “exciter” in them and won’t produce any current below approx 1000 rpm.
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Old 08-21-2005, 02:58   #4 (permalink)
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Re: Alternator problems on XF

Problem seems to have gone away, but multimeter revealed 12.5V at idle for a bit then went up to 13.9V. I'll just get a friend on mine to reco the alternator and rewind it to crank out 120A (he's done it before). Just a matter of getting it around to him.
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