Trueno headlight help

[banpei]

Page 30 of the USDM manual shows you the wiring diagram for the headlights:
http://files.aeu86.org/manuals/ewd-ae86-...parrot.pdf
The wiring diagram should be similar to the Trueno one.
I think Pack is referring to the light retainer relay that switches the retractors as well.

On page 34 you can find the illumination diagram used. You already swapped the headlight switch, so that rules out the rheostat being broken. The only relays between the illumination and the switch are the headlight retainer relay and the taillight relay. If your taillights are functioning fine, I would say both relays are fine.