12 VOLT FROM THE BATTERY SOURCE GOES TO 12VOLT BATT CONNECTION.12 VOLT GROUND RETURN MUST BE FIXED TO THE FRAME OF THE VEHICLE.SOME VEHICLES HAVE FACTORY GROUNDS UP HIGH ON THE SIDES OF MOST VEHICLES, U CAN USE THIS GROUND LOCATION. IF CONNECT REMOTE WIRE FROM THE RADIOS REMOTE TURN ON LEAD WHICH IS A BLUE/WHITE WIRE OR A STANDARD BLUE IF ITS JUST ONE BLUE WIRE. CONNECT THIS LEAD TO THE REMOTE TURN ON CONNECTION ON THE AMP , SOME KENWOODS HAVE TWO ,INPUT AND OUTPUT LEADS.U ALSO NEED A TEST LIGHT, OR U CAN USE A SPEAKER TO TEST FOR POWER AT UR CONNECTION.IF U USE A TEST LIGHT , CLAMP THE END U WOULD GROUND TO THE VEHICLE, TO THE AMPS GROUND, THEN TOUCH THE PROBE END OF THE TEST LIGHT TO UR WIRED CONNECTION TO VERIFY U HAVE POWER AND GROUND TO YOUR CONNECTION.IF TEST LIGHT DOESN'T WORK ,CHECK UR FUSE AND REMOTE TURN OR LEADS.