rogerowens

1992 LS400 Battery charging issues.

Approximately 3 weeks ago, while sitting at a traffic ligh, radio goes quite, eventually shuts off and car dies

Once pushed off to the side of the road, I had the car jumped and it started right up. Battery tested immediately tested GOOD. Alternator tested, tested GOOD.

Car ran fine for a few days and began to have same type of problem. Lights would come on the dash, radio would go silent and car would eventually just die.

After several more tests at parts store, battery finally tested BAD. Replaced battery and car ran fine with no issues for about a week and same problem re-occured.

I have noticed now when the dash lights come on, revving the engine to about 3,000 rpms the lights go off but eventually battery drains.

I have checked battery terminals and ran ground wires etc. to see if there was a noticeable problem but found nothing.

This weekend I removed alternator, took it to a parts store where it again tested GOOD.

Not sure if I should go ahead and replace or rebuild alternator??

I failed to mention that over the past week or so I noticed the instrument panel lights would blink when I apply the brakes. This was not happening prior. Not sure if this is related or not??

If you have any suggestions a this point I would appreciate it. Thanks!

jaaa

I've had other cars(not a lexus) where the ground points to the chassis would corrode over time and cause all kinds of problems. You might follow all ground points and sand then grease all contact points.

RA40

iTrader: (6)

Are all the lights working correctly? One thought is the trunk hinge wiring. We'll often see breaks and grounding issues from this.

Any recent electrical work?

rogerowens

As a matter of fact, my left brake light went out. Found out when I got pulled over. Tried to replace the bulb but it was fine. Determined it was the device the bulb plugs into. I took it out in an attempt to find a replacement. Could be the issue??

RA40

iTrader: (6)

On the hinge there is a wire loom at runs along the bottom of the arm. Breaks in the wiring cause the taillight bulbs to burn out or not work. Remove the rubber cover piece and examine the wires along that section. These often ground out causing shorts that also effect other electrical areas of the car.

http://www.lexls.com/tutorials/lighting/bulbout.html

KJG92

I'm having the exact same issue. The PO replaced the board the bulbs go in already. Next step is to get into that wire harness.