Car failed MOT because the guy sat with the engine off while he tested the headlights etc. I also have 4 gauges that light up with the ignition lights on.
With the car started and multimeter on - I get about 13.2 - 13.5V
Does this mean the battery is at fault or the alternator, or are these batterys just crap that they drain very quickly???
That battery has sat since October, and the car started first time [after I rebuilt it] in June without having to charge it. And it had started every day since then ok until MOT time, and it dies quite quickly when engine if off and lights are on.
I tested it when I came home - battery was reading 12.8V - turned on headlights with radiator fan and heater fan - the voltage dropped relatively quickly - went to start it with about 12.2V and it tried, clicked and reset the clocks....batterys dead
Do I need a new battery would you say? or possibly a heavier duty battery? Sorry about the serious description but its what happened haha.