The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Headlight relay mod revisited...my way to do it and save some money

Tx Firefighter · 02-06-2006, 08:28 PM

72Mario. Basically, here's the deal. Power must travel from your battery all the way to the light switch then back to the lights. This induces a lot of resistance and voltage drop. The end result is that far less than battery voltage reaches the lights, causing them to not be as bright as they could be.

The relay mod changes all this. It makes it to where the power only has to go from the battery through the relay on the core support and then to the headlights. This is a much shorter pathway with fewer sources of resistance. The end result is full battery power reaches the headlight and that gives 30 to 50 percent improvement in headlight output.

Mad electrical has a great article on their website which explains this fully, in easy to understand language.

02-06-2006, 08:28 PM	#14
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: Headlight relay mod revisited...my way to do it and save some money 72Mario. Basically, here's the deal. Power must travel from your battery all the way to the light switch then back to the lights. This induces a lot of resistance and voltage drop. The end result is that far less than battery voltage reaches the lights, causing them to not be as bright as they could be. The relay mod changes all this. It makes it to where the power only has to go from the battery through the relay on the core support and then to the headlights. This is a much shorter pathway with fewer sources of resistance. The end result is full battery power reaches the headlight and that gives 30 to 50 percent improvement in headlight output. Mad electrical has a great article on their website which explains this fully, in easy to understand language. __________________ I'm on the Instagram- @Gearhead_Kevin