Measure voltage at battery with engine running - should be approximately 14 V.
Take the car for a 1-2 hour trip then check battery voltage with engine off - should be around 13 V. Let car sit overnight and measure battery voltage again - if less than 12 V or so, you have a bad battery or a parasitic drain.
Most electrical items in the car will auto-shutdown after a while when the ignition is off. I don't remember if the seat warmers are on that list but would be very surprised if not. FSM will have more info.
|