I rewired my 68, didn`t use relays, the lights are bright in the garage even in the daylight. bigger wire and better fuse block w/ a better design. works for me-
I did the same. Didn't use a relay for the headlights. Used the wiring in the harness and headlights are 10 times better than they were with the old harness. Did use relays on the fuel pump, water pump, and fan though.