Ive been running a single battery now since the end of last year. I run a single bosch 1100CA battery with no problems. I removed everything that had to do with the second battery. Removed the battery, tray, ground. I took the positive cable and ran it over to the alternator and hooked it up there. I then took the factory alternator wire off and removed the red junction block on the driverside. No charging issues and during the winter when it was down in the 20's or 30's it would crank slow but always start.