vltjr

Sunday night my daughter's '90 LS400 stalled out, preceded by usual loss of (electrical) power symptoms (headlights and dash lights dimming, gauges zeroing out). When she tried to restart it, it seemed that she had a dead battery. I went out Monday morning prepared to change out the battery and get it moved to the house, and much to my surprise it started right up. I should mention here that the reason I was prepared to switch batteries is that about a month ago I replaced the alternator with a Denso rebuild, and my suspicion was that I perhaps got a lemon. When I got the car home I checked the battery, and the alternator output, and everything was okay. My daughter is understandably afraid to drive the car until I diagnose and correct whatever caused this malfunction, but I'm at a loss as to how to proceed. I've been driving the car on and off since picking it up hoping that the problem would recur, but it has been starting and driving perfectly.

Anyone have any ideas? Thanks

gmckey

I have the same problem in my 99 LS... it only seems to happen when I have alot of stuff on (HID headlights & fogs, radar detector, radio, AC) but it happens sporatically and I haven't been able to diagnose it either. I'll be driving and all of a sudden the radio will cut out when I tap the brakes or the headlights will cut out when I put on the turn signal... I'm kind of at a loss here as well and don't really understand whats going on either.

19psi

sounds more like a bad wiring problem. check the ground wires and power cables.