Well, after messing around with the harness off and on for a couple of days, I finally have it working right. I had to make some corrections to the layout to get them right…..took some thinking to figure out what was wrong.
Wow, what a difference the harness and new headlight units make! I didn’t drive around with the silverstars on the upgraded harness, but I do have a comparison photo below showing the improvement of the harness alone. Driving around with the Bosch units I am really happy (although I need to get a 30A fuse for the highbeam relay…). The highbeam indicator light in the dash lights with the new harness, although it is a bit dimmer than it was stock.
Below are the comparison shots. I was planning to take some “down the road” photos, but after messing with circuitry, I got fed up, and didn’t bother.
Photo 1: On the right is the stock harness powering the silverstar sealed units, on the left is the same sealed unit running off the upgraded harness. This shot is on lowbeam, I couldn’t get a similar shot for highbeam, as the upgraded harness wouldn’t put out highbeam at the same time the factory harness was under load.
Photos 2 and 3: On the right is the upgraded harness powering the Bosch H4 unit, on the left is the upgraded harness powering the silverstars. Again, these are lowbeam shots. You can clearly see the crisp vertical cut-off of the Bosch units, and how they throw light higher on the right where it helps illuminate signs, pedestrians, animals and such without blinding oncoming drivers. The silverstars on the other hand appear to throw light higher on the side of oncoming traffic. Photo 3 has the truck positioned closer to the wall to distinguish between the output of the 2 units a bit better, and is at a faster shutter speed.