If you have a multimeter take that with you as well, firstly check that its charging correctly by connecting the meter across the battery on the 'volts' range, with the engine running it should read about 14.4 volts.
You can then check for excessive leakage by setting the meter to 'amps' and connecting it in series with the battery ie: remove the + lead and connect it to one meter lead and connect the other one to the battery, with everything turned off for about 3 minutes, it shouldn't read more than about 50ma, very much more than that and you have a fault, if its an amp or two try disconnecting the alternator, otherwise try pulling one fuse at a time until the load drops.
|