I recently purchased and installed the Summit Racing/APC wiring harness for improved headlight brightness and after 4 hours of playing, troubleshooting and wringing out the harness, I have concluded it is junk and NOT COMPATIBLE with 3rd Gen trucks. The harness is wired wrong, the harness headlamp bulb connectors are not compatible with the DC configuration and the 3gen computer does not like relays. The center tap of the factory configuration is GROUND, the aftermarket harness is not. The aftermarket connector forked prong that engages the bulb connector peg is too short to engage properly and the relays cycle at approx once per second when they see and input from the computer (turn the headlights on). I emailed Daniel Stern of the very fine web site http://danielsternlighting.com and he agrees that the computer needs a parallel resistive load across terminals 85 and 86 in order for any relay to work with the 3rd gen computer. I will post again when I try it. Meanwhile, don't waste your money, see Daniel's website for quality parts.