Jump to content

Charging System


Recommended Posts

I have a 93 LS400 2 weeks ago dash light came on and battery was not charging. I live in Sacramento, CA and no one including Lexus dealership had a new alternator on hand I find that amazing, anyway I removed the alternator and took it to a local rebuild shop they rebuilt it for me and I installed it along with a new battery. I checked it with a volt meter not running 12.6V, running 14.4V test drove car and re-checked with same results 2 days later dash light came on again and battery discharged. I charged battery overnight so I could troubleshoot the problem when I checked voltage with engine running the next morning it was putting out the proper 14.4V I put a load on it by turning on headlights and it quit charging again. I turned off lights still no charge at battery, stoped and restarted several times and will not put out voltage. I am pulling out my hair at this point it seems to be heat related as it is putting out a charge when first started and then dropping to 12V after a few minutes. I removed the alternator again and took it to the local Kragen, and autozone both of them said it is good however there test is only a few seconds and I allready know it will work for a few minutes. has anyone ever experienced this type of thing before? any help would be appreciated at this point I will have to order a new alternator and see if that corrects the problem. Does anyone know of any checks I could perform while the alternator is out of the car such as wiring or relays ETC?

Link to comment
Share on other sites

a tough one; no experience with this--but you may consider going back to the rebuild shop[did just have a new rotor and brush assy installed in mine]; find out if they installed a new regulator; this is a circuit board and may be opening when hot.

The shop should have a motorized tester; they could hook up a load and used a heat gun (if needed) on the alternator to simulate your condition. Might find something. They shouldn't charge much(in any) since you just got it repaired there.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...