I've been having problems with my '93 LS400, with my battery draining, just bought a new battery yesterday and the battery light on the dash is already coming back on. I replaced my alternator a little over a year ago along with the wiring and cleaned/retightened all the leads. Also I have been having intermittent issues with the PS pump. Does anyone know what this could be? Thanks.

Edit: I replaced the alternator almost exactly one year ago and its not having the same symptoms. The alternator is charging the battery (tested with voltmeter) and it runs but at idle the voltage fluxuates.

Edit 2: New thread due to old thread being merged with unrelated issue

 

Hello, so checking for drains on the battery is probably easiest done through the fuses with a meter. You can go on youtube and see how they test for parasitic draws through the fuse box. So these are a couple of ways, go to youtube and type in "testing for draws on fusebox" and also a tool people like to use is the "amp hound" which is just a specialty meter, either one works and accomplishes the same goal.