Toyota FJ Cruiser Forum banner

21 - 21 of 21 Posts

·
Registered
Joined
·
327 Posts
Alternators have internal "check valve" circuitry that prevents battery drain through the charging circuitry when the vehicle is not running. When I experienced this, the alternator "tests" run by the auto parts stores didn't reveal the problem. Unfortunately I'm not a good enough electrician to guide you in diagnosis of this problem, maybe others are.
 
21 - 21 of 21 Posts
Top