1 Get voltmeter put on battery with engine shut down.
2 read voltage. Should be about 12 to maybe 12.5
3. Start engine ideally run at idle
4. Check voltage should be around 13 to maybe 14
5, Run engine upto about 1500 and check voltage. Should be around 14 to maybe 14.5.
Now then get an ammeter turn engine off. Pull keys. Put ammeter in series with battery. YOu should have no current.
If you have current then something is left turned on or you have a ungrounded wire ie hot with bad insulation. Now a matter of finding out which circuit is in start by pulling fuses until current stops ie meter goes to zero.
Dan Bentler
