Electrical theory please
Posted: Sun Oct 11, 2015 9:24 am
Good morning,
I've been trying to trace an electrical fault on my son's Opel diesel van for some time now. Problem manifested itself as a starting (or lack of) issue. Over the last month or so I have replaced the battery, starter motor and alternator with new quality items. That has not solved the problem and the battery still has a drain on it.
Yesterday I disconnected the negative lead and charged the battery. Got a 12V reading on my meter. Left the negative cable disconnected and left the van overnight. This morning - no start and voltage down to 7V.
Obviously a drain somewhere but question is - how can that happen if the negative cable was disconnected? Didn't think that a component could draw the current with that cable disconnected.
Cheers
Martin B
I've been trying to trace an electrical fault on my son's Opel diesel van for some time now. Problem manifested itself as a starting (or lack of) issue. Over the last month or so I have replaced the battery, starter motor and alternator with new quality items. That has not solved the problem and the battery still has a drain on it.
Yesterday I disconnected the negative lead and charged the battery. Got a 12V reading on my meter. Left the negative cable disconnected and left the van overnight. This morning - no start and voltage down to 7V.
Obviously a drain somewhere but question is - how can that happen if the negative cable was disconnected? Didn't think that a component could draw the current with that cable disconnected.
Cheers
Martin B