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9th Gen Corolla/1st Gen Matrix (2003-2008) 9th generation Corolla and 1st generation Matrix discussion.

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Old 12-04-2013, 08:03 PM   #1 (permalink)
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battery light back with new alternator

I have a 03 Corolla LE with an auto trans. The battery light came on, sometimes it would stay on and other times it would flash or go out for a time. I hooked up a volt meter for a few day and found out that the alternator was over charging, it would run from 15 to as high as 17 volts.
I put on a new alternator last week and the light was off for a few days, then it came back on and stayed on for the last 3 days. I put the meter back on it for the past few days and the alternator seems to be working perfectly, from just under 14 volts to about 14.5 at all times.
The only other strange thing that's been going on is the daytime running lights haven't been coming on. Could the relay for the lights be causing this? Thanks for any help.
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Old 12-04-2013, 08:10 PM   #2 (permalink)
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I wonder if the over voltage fried some electronics?
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Old 12-05-2013, 05:29 AM   #3 (permalink)
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thanks
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Old 12-05-2013, 07:38 AM   #4 (permalink)
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most replacement alternators are rebuilt and it's pretty common to get a bad one. I'd take it back

Last edited by GREENPUS; 12-05-2013 at 07:42 AM.
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Old 12-05-2013, 10:47 AM   #5 (permalink)
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not rebuilt

It's new, not a rebuilt and the voltage output has been perfect. Why would you think that it's defective?
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Old 12-05-2013, 02:13 PM   #6 (permalink)
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update, went crazy again

I just got into my car to go into town. Right after I started it up I noticed the battery light was off and the daytime running headlights came on. Then I looked down at my meter and the voltage went up to 18 volts, the light flashed a couple of times then stayed on again. By the time I got back the voltage was normal and the light was on. I'm going to take it in to Advance auto parts (where I bought the alternator) and let them test it. I don't know if they will be able to find anything unless its acting up at the time.
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Old 12-05-2013, 02:19 PM   #7 (permalink)
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How old is the battery? Has it been tested?
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Old 12-06-2013, 04:23 AM   #8 (permalink)
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I'm going to do that. I've had the car 5 years and haven't replaced it yet. I don't know when it was installed.
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Old 12-06-2013, 06:33 AM   #9 (permalink)
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I have had bad luck in the past with new aftermarket alternators in my former vehicles. I ended up going with a good used one and that cured my issue. Did you use new aftermarket or new OEM unit? Hope this helps.
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Old 12-06-2013, 08:32 AM   #10 (permalink)
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Quote:
Originally Posted by sparkie561 View Post
It's new, not a rebuilt and the voltage output has been perfect. Why would you think that it's defective?
If it's new and an OEM from toyota then I"d think the alternator is good. If it's an aftermarket, then yes, I would not trust it.
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Old 12-06-2013, 08:34 AM   #11 (permalink)
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Quote:
Originally Posted by dorman68 View Post
I have had bad luck in the past with new aftermarket alternators in my former vehicles. I ended up going with a good used one and that cured my issue. Did you use new aftermarket or new OEM unit? Hope this helps.
yup! Most are rebuilt in some 3rd world country and shipped here. Pure garbage...
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Old 12-06-2013, 10:03 PM   #12 (permalink)
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Just a thought: are your battery cable connections secure at both ends of each cable? (...and also the larger ground connections such as engine-to-body) If your battery circuit is going open occasionally while driving, the car won't go dead (since you're using on-board power from the alternator), but your voltage regulator might go bonkers (to use the scientific explanation ) trying to deal with a charging circuit of suddenly-infinite resistance.
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