Question about 1991 Lexus LS 400
I had the exact same problem or almost 2 years. I kept buying a battery, because I thought that was the problem. I eventually took it to a mechanic and off course the car didn't act up when the mechanic had it for several days. Finally, I checked all of the fuses. It was the cigarette lighter fuse that was blowen. Since I changed that fuse, the car starts up with no problem. It's frustrating everytime you get in the car you cringe when you start it - LOL Hope this helps.
Posted on Jul 08, 2009
While your car is running, measure the voltage at your battery terminals. If the alternator is wotking, it should measure over 13 volts, since the battery is really low. On a healthy battey the voltage is around 14.5 volts when the engine is running. If the car is running and you measured 12.6 volts or less, change the alternator. I have actually worked on a lexus ls400 with exact same problem. I had rebuilt the alternator myself to save the customer on parts. Because altenator is not cheap on lexus. There is an ace hardware by my shop where they carried some carbon brush, all you got to do is file it down to fit, and solder them. Of course you have to open the alternator to do that. The brushes cost about a few bucks. You can buy these at auto parts too but not for that particular alternator. Auto parts like to make money and would rather sell you the whole thing. LOL
Posted on Jun 29, 2009
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Posted on Jan 02, 2017
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