After reading the various Depo threads, beamshots, and writeups, I decided to give a pair a try to see how they work compared to the U.S. spec lamps with HIR bulbs. One concern I had was with the available options for connecting the 9006/9005 stock harness to the H4/H1 setup the Depos use.
The U.S. spec trucks are wired so that when the high beams are turned on, the low beams stay on. The Depos are designed to be swapped for a Eurospec lamp and accordingly when the high beams are flipped on on the Depos, the low beam element of the H4 lamp need to be turned off. The H1 lamp on the Depo's is a driving lamp that can be switched independently.
What I have seen several forum member's do is buy pigtail harness that wire the Depos to work differently than designed. With these harnesses, the H4 low beam is switched on for the low beams, and the H1 driving lamp element is switched on for the high beams. While this works, I wanted to run the lights as they were intended to be used, plus have the H1 driving lamps come on with the H4 high beam element.
I did a bunch of reading about how to accomplish the wiring, scratched my head, did so more reading, and then decided for the time, effort, and possibility of me screwing it all up, to get someone else to do this correctly. I contacted Susquehanna Motorsports (Rallylights.com) as they build custom harnesses. They have an in house person, Ray, who builds custom wiring harnesses. Ray and I exchanged several e-mails where he asked for the wiring diagram for the truck, how I wanted the lamps configured, etc., to ensure they functioned the way I wanted. An order was placed, and $140 later I get this nice beefy harness in the mail (shown next to the Slee harness for scale):
The U.S. spec trucks are wired so that when the high beams are turned on, the low beams stay on. The Depos are designed to be swapped for a Eurospec lamp and accordingly when the high beams are flipped on on the Depos, the low beam element of the H4 lamp need to be turned off. The H1 lamp on the Depo's is a driving lamp that can be switched independently.
What I have seen several forum member's do is buy pigtail harness that wire the Depos to work differently than designed. With these harnesses, the H4 low beam is switched on for the low beams, and the H1 driving lamp element is switched on for the high beams. While this works, I wanted to run the lights as they were intended to be used, plus have the H1 driving lamps come on with the H4 high beam element.
I did a bunch of reading about how to accomplish the wiring, scratched my head, did so more reading, and then decided for the time, effort, and possibility of me screwing it all up, to get someone else to do this correctly. I contacted Susquehanna Motorsports (Rallylights.com) as they build custom harnesses. They have an in house person, Ray, who builds custom wiring harnesses. Ray and I exchanged several e-mails where he asked for the wiring diagram for the truck, how I wanted the lamps configured, etc., to ensure they functioned the way I wanted. An order was placed, and $140 later I get this nice beefy harness in the mail (shown next to the Slee harness for scale):
Last edited: