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1991 Lexus LS 400 BATTERY DIES AND CAR SHUTS OFF WHILE DRIV

Tiny
CARRIEDEVANE
  • MEMBER
  • 1991 LEXUS LS 400
Electrical problem
1991 Lexus LS 400 V8 Automatic

It's me again. The girl who's havin all the trouble with no power to the inside of the car. Yesterday I drove it to a friends house and when we went out to start it the battery was dead. We got a jump and as we were driving it died. We got it jumped again and it died when I was parking it as soon as I hit the brakes. Does this mean my alternator is bad? And if so could that also be the reason there was no power going to the inside of the car?
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Wednesday, September 17th, 2008 AT 12:15 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Get the battery and alternator load tested-one might not be putting out the other is not taking it.
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Wednesday, September 17th, 2008 AT 2:39 PM
Tiny
CARRIEDEVANE
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The battery had a full charge that day. We had put it on a charger a couple days earlier and it started everytime I tried it during the next two days. It wasn't until I drove it that it died. How do u get the load checked and what does that mean?
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Thursday, September 18th, 2008 AT 11:38 AM
Tiny
RASMATAZ
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Alternator load check is where you apply resistance by using a rheostat to it for a given time/speed to make the alternator throw out its maximum current output. Same goes to the battery applying a given current draw for given time such 15secs to check whether the battey will hold 9.6 volts in that time.

All you need to check both is a voltmeter

The battery should read an open voltage of 12.6 and up volts.

Alternator while vehicle is idling should be within 2 volts from the open voltage of the battery if its charging the battery.
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Thursday, September 18th, 2008 AT 12:58 PM
Tiny
CARRIEDEVANE
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Thank you so much! I will try this as soon as possible.I found out today that the battery and alternator are both still under warranty so I will be able to replace them if needed. Thank you for your advice and I will let you know how it works out.
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Thursday, September 18th, 2008 AT 1:55 PM

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