Right, just been sourcing the wiring feeds for the rear of the L/w, 6 cables feed through the chassis to the rear, have sussed 5 of them with simple testing. But one wire has no feed at all as far as I can see,
its red/brown.
The others check out
Red/yel=Convoy
Red/Blk=Tail Lights
Grn/Whi=R/H Ind
Grn/Red=L/H Ind
Grn/Pur=Brake lights
This does not have a switching for Fogs, too early I think on a '74
The idea is to re route the feeds from the chassis into the cab through a junction box behind the bulkead, and feed new wiring down the tub to the lights. Just hate loose ends
Cant lay my hands on the wiring diag for the mils at the moment