i would recommend a harness. without one all the power is running trough the headlight switch then if you have the high4 done now the lows and highs are running trough the switch. this is why gmt-400 burn up headlight switches.
also if you get a harness from ddm SEAL IT UP. i had one and it failed and turned the lights on in the middle of the day and ran the battery dead. i would recommend making a harness for the highs and lows or buying one from meangreen. it will also make your halogen highs brighter.
also if you get a harness from ddm SEAL IT UP. i had one and it failed and turned the lights on in the middle of the day and ran the battery dead. i would recommend making a harness for the highs and lows or buying one from meangreen. it will also make your halogen highs brighter.