I have @ 4~5 older vehicles (haven't done the 68 'Vert yet) that I've required with relays for several functions including headlights and the difference is amazing :yes:
My 77 Chevy 4X4 has halogens and the relay system - for both the road lights and the extra off-road lights - I actually did this mod back in the 80s when I raced in SoCal and Mexico. The difference is literally 'Night & Day'
We even have this system on an old farm tractor converted to have a 6&12vdc system. The lights and one axillary elec/hydraulic lift are 12v and you can now actually see on dark nights vs. the old 6v lights, that worked fairly well on bright moon-lit nights ...
It's worth it :beers:
If this wasn't the best way to wire a system, the manufactures wouldn't be spending millions building their vehicles this way :thumbsup:
Can't think of single modern system that doesn't use relays to power most loads.