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Did I just fry my alternator??
#1
Had to jump start one of my daily driver cars (1999 Falcon Ute, battery dead flat) so that I could get the Mustang out for a drive.

So I ran the jumper leads from my Mustang, while it was running, to my Falcon. Well the Falcon wouldn't turn over at all, just various clicking noises and such, so I came to the realization that I needed to hook the Falcon up to a battery charger and get at least some charge into it before jump starting.

So after half an hour on the charger I hooked up the jumpers again from the stang and this time the Falcon roared to life.

Went back to the Mustang and noticed the volt gauge showing low, so check the stang's battery with a voltmeter while it was running and sure enough I am only getting 11.89 volts across the terminals.

Immediately thought that I've wrecked the regulator so swapped it out with a brand new solid state one that I had lying around, still no good.

The charge light on the dash goes out like it should, I've checked all my wiring to make sure no wires had come loose or broken and it all looks ok. It was running at about a 13.5 volt charge before the jumpstart episode.

So I'm at a loss, did I just wreck my alternator? Anybody got ideas as to what can go wrong during a jumpstart that would stop my stang from charging??

Thanks

Brett
[Image: stangprofile3.jpg]
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#2
If you inadvertently invert the +/- cables, it will smoke an alternator, pronto.
Been there once Undecided .

Pete - MotoArts Decals and Signs
'71 Sportsroof 351C-4V/4-speed - FINALLY under construction - no, wait, on hold again...
'90 Mustang 7-Up 5.0 ragtop, rolling beater
'66 Sunbeam Tiger Mk.IA, survivor
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#3
Well, took my alternator and regulator/s to the auto elec who tested them and said they are ok and suggested I check the fuses. Before I bothered to check any fuses I put the alternator and regulator back into the car, started it and lo and behold the car is charging properly again! Can only think the problem was a bad connection perhaps.... Chin still, I'm not complaining Smile

Brett
[Image: stangprofile3.jpg]
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#4
Sweet. Good deal.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#5
Glad to hear you got it sorted.

A few weeks back my alternator belt was getting noisy. Turns out it was misaligned and it's not a Ford alternator! Also when it was removed found a big crack on the underside of the casing. So this week fitting a nice new alternator from CJs and new wiring. I guess it was fitted back in the 70s when US Ford parts were hard to get hold of in the UK.
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