Hot Alternator, Low Output - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

Bard-Endee · 09-29-2005, 05:52

I've got an alternator in my Tempo that loses voltage as I rev the engine, even while parked. Revving with A/C, radio, and headlights on, the output dips below 12 V. Also, the alternator gets VERY hot.

What might be causing this? Do I need to simply replace the alternator? Should I be looking at any other system?

I posted a long-winded description of my symptoms at
Hot Alternator, Low Output

Thanks in advance for any help.

--Bard-Endee

351cid · 09-29-2005, 06:14

sounds like a new alternater on the shoping list.

you might be able to get a higher amp one to replace it if you are putting heavier loads( bigger lights , sterio , etc ) on it then standard.

Freshmeat · 09-29-2005, 08:21

Something I would strongly suggest is finding a local alternator shop and paying them to rebuild it. They can re-wind it with much more efficient coils so it'll have significantly higher output. I have a buddy who recently did that with his stock 85amp alternator and now it's pulling 180amps. It'll be about the cost of an alternator from the parts store (which are also rebuilt, so it's not like those would be any newer) and you'll have an actual person to talk to about rebuilding it instead of dealing with the parts store, God forbid something go wrong.

Bard-Endee · 09-29-2005, 09:03

Hmm... I'm not putting any bigger load on it than at any time in the past. Nothing customized on my baby. lol

What would be a "standard" amperage for an alternator in my car?

Freshmeat · 09-29-2005, 13:29

You're likely between 60-85 amps. I'd still say go get it rebuilt- even if you're going back to the original amperage, it'll be cheaper than the parts store.

Bard-Endee · 09-29-2005, 22:36

Thanks for the feedback, guys!