I recently purchased a used 2000 rx300. At the dealership it started no problem. On two occasions. But when I brought it home and let it sit overnight it doesn't crank. At first I thought it drained because the radio was still on. Turned that off. Problem persist. Then the display stayed on, but when I put the ignition switch in the lock position that fixed the problem.

I'm at a loss. When I boost off the battery it runs just fine but I can't keep doing that.

Thoughts or suggestions?

 

bring the battery to a parts store. Alot of them including Walmart will do a deep cycle battery test for little money or free. If it checks out fine, then you may have alternator, starter or cable problems.

 

Although fastnoypi is correct, since you bought it recently, take it to the dealer for free repair. .. unless you bought it 'as is'. They still might look at it for free.

Salim

 

It has 220000 miles on it. Bought it as is. I'll take it to the used car dealer tomorrow.

Thanks for the replies.