battery draining while driving
hi, can anyone help me with this issue?
i normally have no issue with the battery, it holds charge fine as i use it daily for short trips to work, but a couple of times recently after going for longer drives (15-30 mins) i've stopped briefly and come back to a dead battery. on both these occasions i've had the stereo on which i don't normally do cos i can't be bothered to replace the faceplate (i keep it in the glovebox as a cunning security measure to fool any wouldbe thieves!). i know stereos can drain the battery - especially aftermarket ones like mine - but can't understand why it would be happening while driving. i'm sure the alternator and battery must be fine as i don't normally have a problem. also, i've used the stereo on long trips and had no problem, so i could be barking up completely the wrong tree. hopefully someone out there with more knowledge than me will have an answer.