My mini is an cooper sportspack mpi 98, fairly original to my knowledge. I have a problem with the battery draining with the car is turned off. The multimeter reads from the battery a normal range but then starts dropping 00.01 about every 30 seconds or so. What could be wrong? The battery and fuses are new and the alternator must work because if the car is started charge is put back into the battery.
Mini Battery Drain
Started by
GoochieC123
, Feb 28 2016 03:39 PM
3 replies to this topic
#2
David128
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Super Mini Mad
- Location: Rochdale
Posted 28 February 2016 - 04:12 PM
Disconnect the battery. wire your meter in series on amp setting with the disconnected lead and the battery terminal with ign off. start pulling fuses to identify circuit. It could still be a bad alternator diode. but try to eliminate other possiblities first
Edited by David128, 28 February 2016 - 04:13 PM.
#3
Cooperman
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Uncle Cooperman, Voted Mr TMF 2011
- Location: Cambs.
- Local Club: MCR, HAMOC, Chelmsford M.C.
Posted 28 February 2016 - 08:20 PM
I have had that with a similar age Rover 214Si. It was the security system which was draining it down over a period of around a week or so.
#4
KernowCooper
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- Mini Docs
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Sparkie
- Name: Dave
- Location: The South West
- Local Club: Kernow Mini Club
Posted 02 March 2016 - 08:10 PM
If your testing the battery voltage after the engines been running then the battery will show a higher float voltage, this could be 13.7v as soon as switched off and slowly drop back to a 100% charged voltage of 12.65v which is fully charged. Check as Cooperman pointed out any discharge once the battery has settled (3-4hrs) and your looking for around 350-500mA at most due to ecu/immobliser and any alarm fitted. much more and you will have to pull the fuses and see which circuit is causing the extra current drain.
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