A standard 4-pin or 5-pin relay setup is the safest method for single or dual light installations. Harbor Freight Connection Point Battery Positive (+) Main power input (requires an inline fuse). Chassis Ground (-) Ground for the relay's internal coil. Switch Output Triggers the relay when the cabin switch is "On". LED Light (+) Sends power to the light(s) when triggered. Auxiliary Output
Note: This is a common point of confusion. In general DC automotive wiring, Black is often Ground. However, some proprietary diagrams switch these. Always assume Black is Ground first, but test if the light fails to illuminate. Roadshock Led Wiring Diagram
Used for the amber running light circuit; connect this to your vehicle's existing amber running light wire. A standard 4-pin or 5-pin relay setup is
Use an inline fuse holder.