Question about 1991 Lexus LS 400

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My 1991 lexus ls400

Hello my name is Lisa and all my dashboard lights on my lexus ls400 are staying on even while I'm driving. Two weeks ago, I got my air conditioner serviced and got a new battery(by the way can you tell me what voltage of battery I need). The car is not staying charged and the radio goes off when the air conditioner is on. Then when I turn it off, I need a jump to get it started again. Where do you think we should start at?

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  • lpayne93313 Jul 18, 2008

    Thank you for the information.

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The most likely problem is your alternator, the alternator charges your battery while the engine is running, if the alternator is bad you have a dead battery, but you can check with a volt meter to ensure that is your problem. Start your car (use a battery charger or jump to start it if you need to) and put your meter on the battery post's. If your reading 13volts or so your alternator is working and maintaing voltage, however if your reading starts dropping to 10 or less(may take a few moments to drop) then it's probably your alternator. You can also check your battery's voltage before starting your vechile, if the voltage increases after you start the vechile then it seem to be charging. Alternators can be repalced somewhat easily, it's only two boltsm however you do have to remove the fan belt, and re-route after installing the new alternator. If you have some expirence working on cars you can do this yourself in your driveway.
Good luck

Here's a start for you, hope this helps

Posted on Jul 18, 2008

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