The sooner somebody makes a matched set of 280Z Headlight connectors (Round, white, 4-position/3-wire connector) the sooner I can make Plug and play headlight upgrade harnesses for the 260/280Z's...
Seems like A LOT of posts and most of it is confusing to those who don't know 12VDC systems....
Grab your inputs from the headlight connector in front of the radiator on the passenger (right) side.
Red = power from fuse box and headlight switch
Red/Black = Low beam (-) wire from Hi/Lo beam switch on the turn signal switch
Red/White = High beam (-) wire from Hi/Lo beam switch on the turn signal switch
Ground the Black or solid Red wire on each headlight pigtail, directly to the frame (clean the metal and bolt down the wire snug)
on the engine harness right side plug....
red to pin #85 on both relays
red/black to #86 on #1 relay
red/white to #86 on #2 relay
#30 on both relays gets fused power from the battery
#87 on relay #1 to the red/black on the headlight pigtail of both headlights
#87 on relay #2 to the red/white on both headlight pigtail on both headlights
Like I said, if somebody can make the connectors AND find the 5mm?? male and female bullets (large bullet connectors on these plugs) then I can make P+P harnesses with no cutting, drilling or hurting the stock harness.
Hope this helps for now.