Forgot to mention the headlights weren't a straight forward swap as the rear housings on the new H4 assemblies wouldn't pass through the headlight buckets and the locator 'feet' in the corners of the headlights were too tall and needed to be ground down a touch to make them fit. The washer bottle was not much more than a pile of crumbling cheese so I found a suitable replacement for cheaps from the magical land of ebay. The new headlight harness was supposed to be a 4 ceramic socket kit but it turned out to be only a 2 socket kit. This actually solved a problem for me as I wanted full function of all the headlights instead of the inners running high beam only. I'll have a second headlight switch controlling the inner headlights from another headlight harness which I can run from the factory harness wiring where I've cut off the redundant headlight plugs. I can add a fuse to the relay block and run power through it straight from the battery. Admittedly this whole process has made the wiring appear more complicated but it should take a load off the factory headlight circuit and make it more efficient. The added bonus is once I have it rigged up, I can undo one or 2 plugs and remove nearly all of the front harness with it's own relays and fuses in one hit - headlights, thermo fans, A/C and some of the engine wiring as well without having to remove the whole harness from the truck.