The Baja Designs 640177 is a universal backlight add-on harness for S8 Series light bars. It was designed for owners who have no backlight wiring solution and want to add one to their current harness. Because it plugs into the light's existing connection, you can enable the backlit function without running a separate circuit from the battery.
Compared with assembling a generic fuse tap kit and splice wire, this harness arrives matched to the S8 plug. It includes four common fuse taps, an alternate splice connector, and zip ties. The splice connector is a fallback for fuse panels where none of the taps fit, and the harness features plenty of length to reach the fuse panel, or a splice to keyed power. The kit ships without a switch or mounting hardware, so budget for a backlight switch separately.
Per the manufacturer's installation sheet, the tools required are a circuit test light or multimeter and a standard flathead screwdriver. With the key on, test each side of a fuse socket. When the test light illuminates, or the multimeter DC voltage measures 12-14V, the power side of the fuse has been determined. Insert the fuse tap into the socket with the arrowed side blade contacting the power side. Plug in the backlight harness to the female bullet receptacle of the fuse tap. Route the lead along the existing S8 harness and secure it with the included zip ties.
No. The manufacturer lists the kit as including the harness, four fuse taps, an alternate splice connector, zip ties, and instructions, with no switch and no mounting hardware.
The manufacturer's installation sheet calls for a circuit test light or multimeter and a standard flathead screwdriver.
The manufacturer's instructions say to check the fuse box cover or owner's manual for fuse locations, then use a test light or multimeter with the key on. The power side of the socket should read 12-14V DC.
Most of this job is locating a fuse that is powered with the key on, which the manufacturer's sheet walks through step by step. The tap steps are simple, but check the power side of each socket before committing, since tapping the wrong side will not give you a working backlight. Keep the backlight lead tied away from hot, moving, or sharp engine components. Buyers searching for an S8 backlight fuse tap install or a 640177 wiring harness guide will find these steps match the manufacturer's installation sheet.
