I can't find it

[YNOT]

I had a faulty diode on my alternator that wasnt connected properly, you can replace these I beleive. It amazingly will drain your battieries over night to the point your rig will only just start. Happened to me even on brand new battieries, draws just over 1 amp every something I forget lol I also had a shagged alternator anyway so ended up replacing the whole unit.

This is a common fault.

Tony