Battery light on - what could cause it

Joined
May 9, 2009
Messages
165
Location
Boston suburb
 
 
LC 07, 190k, alternator replaced at 145k, battery replaced in October, 2019. Battery light on dashboard turned on two weeks ago and today. Both times turned off after starting a car and running it for a bit. Car was seating on a driveway without driving since Sunday - not that long.
Do I have a leak in electrical system draining battery? Something else?
 
Joined
May 26, 2008
Messages
182
Location
Calgary
 
 
Could be a drain somewhere. Disconnect a battery pole and test with ammeter. If you see 0.1 amps thats 1.2 watts per hour your battery is draining at. If you have a 600 Amp hour battery you should have 6000 hours before it's dead or roughly 6 months.
 
Joined
May 9, 2009
Messages
165
Location
Boston suburb
 
 
Alternator was done by previous owner at Toyota dealership - hopefully it is Toyota remanufactured one. Will check for a drain. So far - light is not coming up after a bit of driving.
 
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