He says its something in the install, but i know i did everything proper. All 1/0 gauge running from two batteries. Grounded to factory ground(since its located in the back of my car), so i know its sanded down. System holds 14.4V on idle and never goes below 12.3 full tilt on idle RPM. Batteries rest at 12.3-12.7 with car off. Using a battery load tester shows both batteries to be in perfect condition. All connections are solid and all wires are crimped extremely well into their respective terminals