Alternator is putting out 11.9 volts from main post to + battery post. The (new) Battery has 11.9volts when I meter it post to post (-to+) but the battery light comes on. I drove through the rain yesterday and the battery light came on as I went over a medium size puddle. I went out last nastnight, the light was not on, I drove to work today and the light is back on.
Alternator or voltage regulator is faulty
the battery charge should be 12-13.2 volts for a
good battery going up to 14.5-14.8 volts dc at rpm over 1500
take it to an accredited auto electrician for a proper diagnosis and test
Alternator should be putting out about 14
SOURCE: replaced alternator and battery 2x and only works for short time.
This could be caused by a faulty voltage regulator, but since it has happened on more that one alternator, that can't be the problem, right? The next thing that I would look at would be a defective or loose belt. Also check the tensioner to make sure it is working properly and is keeping tension on the belt. If the belt is slipping or is worn out, it will cause voltage fluctuations. You may want to look at changing or at least inspecting the belt. Hope this helps and best wishes.
SOURCE: put new alternator on getting fire to charge light
you may need to go back and get another alternator cause this one sounds as if it has a bad voltage regulator in it also give these websites a try www.autozone.com and www.alldatadiy.com also checkout your drivebelt if the car has over 40,000 miles on it you may want to change it also wish you the best of luck Michigan Man.
SOURCE: Bought a 1997 mercury sable
Try checking the altenator. If the starter and battery were gimpy, the altenator may have a blown regulator too!. It sounds like there is a short in the system causing this problem. Most likely the altenator or component in the charging loop. WF
SOURCE: battery light comes on and i put a new battery in
Could also be an exposed wire intermittenly contacting a ground. local auto parts stores are known to check alternators for free or close to it. get that and the regulator checked first. because finding an exposed wire is time consuming and a pain.
SOURCE: I have a 97 Sable
that's becasue the new abattery went dead because it was not charging. The battery light must be OFF to charge the battery. Take it back to whoever fixed it. May be a bad wire betwen battery & alternator too.
check the 175 amp mega fuse in the engine compartment.
cehck this ground for a good connection - G104
Left front fender near air cleaner
check the 20 amp fuse for the charging system. Fuse 26 in teh engine compartment fuse box.
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