92 Ls400 Charging System Issue

[mejojo]

All was fine with the car until I took it in to a shop due to A/C leak. They said they found a corroded O-Ring somewhere beneath the battery that had been ruined.

So, they fixed that, and A/C is working great, but tonight while driving (100 miles after picking up the car) the battery drained out while I was driving.

My suspicion is that the A/C guy unhooked something that connects the alternator to the battery and didn't hook it back up when he was done.

For reasons of convenience, I'd like to find the problem myself rather than take it back to the shop, if possible.

Any ideas what someone might have undone in the vicinity of the battery to do that service that would disconnect the charging system?

Thanks much in advance for any help,

Joe

[mejojo]

All was fine with the car until I took it in to a shop due to A/C leak. They said they found a corroded O-Ring somewhere beneath the battery that had been ruined.

So, they fixed that, and A/C is working great, but tonight while driving (100 miles after picking up the car) the battery drained out while I was driving.

My suspicion is that the A/C guy unhooked something that connects the alternator to the battery and didn't hook it back up when he was done.

For reasons of convenience, I'd like to find the problem myself rather than take it back to the shop, if possible.

Any ideas what someone might have undone in the vicinity of the battery to do that service that would disconnect the charging system?

Thanks much in advance for any help,

Joe

UPDATE - Shop reports alternator charges when cold, but not when it warms up. They say they load-tested to battery and verified it's okay. Good thing the weekend is coming up...will also be doing the shocks, so it'll be an all-Lexus weekend for me.

Joe