Hello all. Very new to tuning so bare with me. I am using a 2013 Chevy Cruze 1.4 turbo motor in our competition rock crawler buggy. It's a 1.4 to a 904 trans and an atlas transfer case. I had a company go thru the harness to make it a simple 4 wire stand alone. Re flash the computer to eliminate what I don't need.

Problem I'm having is intermittent voltage readings. I have a code reader (ultra gauge) hooked up at all times as well as a voltage meter in the dash. When I start the engine I'll see something 10.9 volts and 22psi of oil pressure at idle. On its own the charging system will ramp up to 15.4 volts. But when that happens I'll see oil pressure drop to zero. I don't know if the two are even related really . But on a trip this past weekend I ended up killing the battery because most of the day the volts were down at 10.9 ish. Is there something I should be looking at other than just "bad alternator"?

Thanks for any help and sorry for a poor description.