ONE NOTE TO PASS TO FELLOW RACERS-BEST THING FOR YOUR REAR MOUNTED BATTERY SET UPS IS TO HAVE A GOOD HEAVY DUTY LINE FROM ALTERNATOR BACK TO THE POSITIVE ON BATT. I USED HEAVY 4 GAGE WELDING WIRE AND ABSOULUTELY NO PROBLEMS WITH 1 OPTIMA RED BATTERY AND POWERHOUSE 120 AMP ALT.IT WASNT HOLDING AS GOOD OF A CHARGE WITH SMALLER GAGE WIRE!!!!