389 Headlights on 379EXHD

I can email you the schematics, but in all honesty, you could test the wires faster. The best way to do this would be to get new plug ends for your 379's headlight harnesses to replace the plugs on the 389 lights. Then plug them in without splicing. You'll nee the proper pins, which you can get from Pete too, and the crimping tool. That way there are no splices and less chance of problems.

 

Many ppl converted 389 headlights to other styles if they run in colder climates apparently not very good in salty conditions.. I've never used them so can't verify that though

 

We have a bunch of 388/389's that run the northeast and they're fine. If you break a lens, they're expensive. They do get yellow and dull after a few years, buffing them works well to get them clear again, but it's short lived. You end up buffing them every few months. That's typical with most plastic lenses though.

One thing I do recommend (which I should have in the first place because you can't do it on the truck), you should take those assemblies all apart and put anti-seize on all the little screws and bolts that hold the lenses in. After a few years, chances are that a few will break off if you need to change a lens.