Where do I start looking for a current drain?
Long story short: Car has been fine (200 mile round trip Thursday). Tuesday morning battery flatter than a pancake (not a flicker). Left it on charge all day (4Amp charger on max) still flat in the evening (lights + locking but not enough to start). Disconnected battery and charged overnight.
Next day big spark connecting battery back up. Started fine but dead again when I tried a few hours later. I've been intending to change the 10 year old battery so bit the bullet and bought a decent Yuasa earlier. Car started noticeably livelier than usual however 6 hours later battery too flat to start :x
It's an 80Ah battery. Allowing for it having been standing in the shop for a while lets say it started off good for 70Ah. I know its not scientific or strictly accurate but lets say it should still crank the car at a third charge (26Ah). On that basis its lost over 44Ah in 6 hours. i.e. Average of >7 Amps current draw (consistent perhaps with the big spark reconnecting the terminals). That's 88 watts that are going somewhere.
This seems to me to be quite a high current when no lights on and I can't hear anything. I guess either something is moving very quietly (not typical of a Z4!) or more something is getting hot.
Any thoughts about where I might start looking for the drain?
Long story short: Car has been fine (200 mile round trip Thursday). Tuesday morning battery flatter than a pancake (not a flicker). Left it on charge all day (4Amp charger on max) still flat in the evening (lights + locking but not enough to start). Disconnected battery and charged overnight.
Next day big spark connecting battery back up. Started fine but dead again when I tried a few hours later. I've been intending to change the 10 year old battery so bit the bullet and bought a decent Yuasa earlier. Car started noticeably livelier than usual however 6 hours later battery too flat to start :x
It's an 80Ah battery. Allowing for it having been standing in the shop for a while lets say it started off good for 70Ah. I know its not scientific or strictly accurate but lets say it should still crank the car at a third charge (26Ah). On that basis its lost over 44Ah in 6 hours. i.e. Average of >7 Amps current draw (consistent perhaps with the big spark reconnecting the terminals). That's 88 watts that are going somewhere.
This seems to me to be quite a high current when no lights on and I can't hear anything. I guess either something is moving very quietly (not typical of a Z4!) or more something is getting hot.
Any thoughts about where I might start looking for the drain?
