Technical no headlights

[neveragainducato]

i have a 92 was 19 td is now 25 slomo ducato camper. my problem is the last sentence but i must get the head lights [and other things!] fixed first before i can sell it off beachy head.
the aformentioned headlights stopped working.
lamps are good, fuses are good, relays are good, and the wiring changes colour at least 3 times so i dont know which to check! any ideas?
gonna put on status quo and find a wall