just realised that my Apexi turbo timer has a battery voltage display on it and when the car is idling its at 12.5 but when i switch on the lights it goes to 12, is this an altenator problem?
if your belt is loose thats why it would be giving a low voltage reading, tighten the belt or if its fooked replace, any belt will do waste of money buying expensive alternater belts!
r32 oil pressure gauges are known to be faulty mines the exact same mate !![]()
man if your belt is slipping it wont be gripping your alt pulley properly,thus resulting in the alt not running at the speed it should, thus resulting in your flat battery, simple!
Its not the gauge that reads incorrectly on the R32, its the standard oil pressure sensor that goes faulty. Its on the block beside the oil filter housing.
After market ones are cheap enough but don't assume its just the sensor, get the actual engine oil pressure checked to make sure its ok first.
Change or tighten the alternator belt then a simple test can be done to see if the alternator is putting out the correct voltage.
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