Headlight Relay Harness Upgrade: Why Your S-10 Needs Brighter Power tresseslength.com

A relay harness can also improve the reliability of the S-10’s original electrical controls. Because the relays handle most of the headlight current, less current passes through the factory switches. This can reduce electrical stress on older switches and connectors. However, the harness should not be viewed as a substitute for repairing an unsafe electrical problem. If the truck has melted connectors, damaged wiring, intermittent headlights, or serious corrosion, those problems should be repaired before adding an upgrade.