See if you can back the set screw out of the head you turn, they are/should be loc tight ed in. Heat with a lighter if you can't get them out. Also the 6000mah is to large for the car really. I run the gen's 4800's and 5200 reedy's no problem. I also plug in the inner wires first then install in the car. If you have to you can put a washer stack under the battery post if needed.