Alternator and battery replaced and problem persist
11-24-20, 05:39 AM
#1
Driver School Candidate
Thread Starter
Alternator and battery replaced and problem persist
Car was cutting power to electrical components while running. Replaced alternator and battery to be safe. Purchased parts from Toyota service center. Put on by local shop. Problem continues next day. So I replaced alternator again and it drove fine for about 5 days and now the problem is back. 2007 LS 460 200k miles.
Last edited by Houston562; 11-24-20 at 05:41 AM. Reason: Year and make not listed
11-24-20, 06:35 AM
#3
Please don't take this as a wise azz answer but a good rule of thumb that you've learned the hardway is to determine the problem prior to replacing parts. It can be and usually is a lot cheaper. I would question the shop as to why troubleshooting wasn't performed before installing the new parts, especially if they suggested them. Batteries can be easily checked and done so usually free of charge at various parts' houses. The shop has done you a disservice.
Good suggestion above to make sure the battery cables, both ends, have clean, tight connections and that the cables are in good condition. Good luck.
Good suggestion above to make sure the battery cables, both ends, have clean, tight connections and that the cables are in good condition. Good luck.
11-24-20, 07:18 AM
#4
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Thread Starter
Edit
I did have both checked and they were bad. Battery cables are clean and intact. That’s the reason I feel something may be causing the alternator to malfunction or go bad.
The following 2 users liked this post by jud149:
Caflashbob (11-24-20),
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11-24-20, 01:24 PM
#6
Driver School Candidate
I'd make a list of what's not working and look in the fuse block area if you haven't already. Intermittent problems can be time consuming to diagnose, but it's generally time well spent.
11-30-20, 09:00 AM
#7
Car was cutting power to electrical components while running. Replaced alternator and battery to be safe. Purchased parts from Toyota service center. Put on by local shop. Problem continues next day. So I replaced alternator again and it drove fine for about 5 days and now the problem is back. 2007 LS 460 200k miles.
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11-30-20, 03:50 PM
#8
Driver School Candidate
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It all works fine until the voltage drops and it cuts off things one by one to conserve power.
11-30-20, 03:51 PM
#9
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11-30-20, 04:33 PM
#10
11-30-20, 05:57 PM
#11
If they are using remanufactured alternators, they really could be defective.
12-02-20, 09:23 AM
#12
Driver School Candidate
Thread Starter
Fixed
It was a connection loose to the fuse box under the hood near the battery. I found it myself and tightened it and voltage went up to 14 immediately.
12-04-20, 05:45 AM
#14
