Outer Limits 4x4 Board

Howdy
Went to start the wagon(GQ LWB)on Sunday only to find that it was struggling to turn over. Took it for a run and all seemed fine in the afternoon. However yesterday morning the batteries were flat( passenger side reading 3.8v and drivers 8.9v) but with a tow start everything ran ok and had both batteries up to 12.8v by the time i got to work.
Decided to replace the passengers side battery because I don't think it will be a happy chappy after being drained that low. When replacing the battery lead there was some rather large arcing happening.

So my question is, before I start the horrible job of tracing the problem, do you guys know if this is a commen fault and where it comes from??? I heard a relay clicking this morning when hooking up the batteries.

If not then I guess I will be busy saturday tracing the problem

Did you have accersories on when you changed the battery?
Check glove box light, tailgate light are switching off. Other then that id do a current draw test, hook up the multimeter and start removing fuses til the current reading drops.

Disconnect your batt lead and hook it back up in series through a multimeter (set to measure amps).

**** important to make sure every accesory and IGNITION key is switched off ****


Then remove each fuse individually and check each time to see which fuse removal drops the amps significantly. You then know which circuit is drawing the power you're losing.

Disconnect everything on this circuit one at a time until you isolate what is drawing the current.

If both batts are going flat overnight then it must be a significant draw. I doubt a glovebox light or any single bulb would flatten both in one night.

Thanks guys, will do that tomorrow. Found part of the problem which was the trailer plug wiring melted to the exhuast but there is still something drawing current