Battery drain
2 Answers
You have a parasitic drain. Lots of videos online about it. Simple to locate maybe a little tougher to fix based on circuit it is associated with.
BritishTech77 answered 7 years ago
Your alternator is drain your battery or battery cell crossed over. Test them individually. With a mulit reader your battery should read approx 12.5 with engine off and 15-16.5volts with engine running. Then alternator should be putting out 13-15 volts whilst running.