My one month old "new" alternator started charging at 18 volts. on 1992 Toyota Camry

This same thing happened with the previous alternator. All my lights, inner and outer would glow or dim in and out, before the high voltage started and then my battery died. My lighting is not dimming yet. It seems brighter somewhat. When I put in the new alternator, the lighting stayed constant, and then the high volts started again at 18 volts yesterday. Last two nators are from Kragen/Oreilly. Very hesitant to drive car.

by in Rancho Santa Margarita, CA on June 06, 2012
Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
2 answers 2 comments
ANSWER by , June 06, 2012
I suspect the quility of the alternators that you have purchaced. The voltage regulator that is intergral with the alternator most likely is causing your problem. Best take it bactk and see if they will exchange it for a better brand. I suggest DENSO as a reliable brand of remaufactured replacement.
COMMENT by , June 13, 2012
I replaced alternator with a "denso" reman. Lighting system has been functioning normally. Charging is normal also. Thanks for the advice.
ANSWER by , June 13, 2012
It has been 7 days since you posted. If you are still driving this car now you will do damage to the PCM(computer). DO NOT DRIVE ANYMORE UNTIL FIXED.
COMMENT by , June 13, 2012
I did not drive car at all, after I got home the same day of problem. Replaced alternator the next day. Lighting and charging are back to normal. Thanks for the advice.