Do Aftermarket wireharness' still need headlight relay mod for headlights??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

74Chevy74 · 07-13-2006, 05:58 PM

If I'm using an aftermarket wiring harness, do I still need to do the upgrade for the aftermarket headlights, or will these harness' support them?

piecesparts · 07-13-2006, 08:14 PM

I suggest that you get the Aftermarket relay and harness. TWO reasons--1) the wiring harness may support the extra load, but the switch is still the same design inside--so a possible problem. 2) The use of the harness will guarantee that there is a full 12 volts at the headlights, not a percentage like you would have using the full wiring system and running the power through the dash and switch. The bulbs will last longer as well as being brighter.

07-13-2006, 05:58 PM	#1
74Chevy74 Registered User Join Date: Nov 2005 Location: San Jose, California Posts: 167	Do Aftermarket wireharness' still need headlight relay mod for headlights??? If I'm using an aftermarket wiring harness, do I still need to do the upgrade for the aftermarket headlights, or will these harness' support them?

07-13-2006, 08:14 PM	#2
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Do Aftermarket wireharness' still need headlight relay mod for headlights??? I suggest that you get the Aftermarket relay and harness. TWO reasons--1) the wiring harness may support the extra load, but the switch is still the same design inside--so a possible problem. 2) The use of the harness will guarantee that there is a full 12 volts at the headlights, not a percentage like you would have using the full wiring system and running the power through the dash and switch. The bulbs will last longer as well as being brighter.



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