yeap, asi mentioned on my previous reply #25... I recall correctly the windshield washer wire running out from engine harness plug... tapped to it up to the front of the engine and pretty sure on 73 leaving the tape close to the firewall to reach the new washer location for this year
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engine view diagram just shows the engine bay devices, not the lighting system.
now, this is hard to read but there is no other brown wire into engine bay aside the wiper harness, the engine harness for ballast and the brown traced one for the washer. I was sure on this because all 71/74 are the same, but just wanted to be sure checking the 71 diagram specifically
( Rally cluster harness shown )
so time to ask once again... are you sure those wires on front end aren't faded color wires ?
Unfortunatelly I don't have 71/73 front lighting harness diagram. All 71/74 are pretty much the same except some wires turned around due some hard changes made by 74 due the interlock system and I have the 74 diagram which is way more technical than previous years and the legend is needed to get it correctly read. I'm really familiar with all 71/74 wiring but mostly because I have workied with them by instict, before get any diagram in hands. That's how I learnt.
Only diff I can think off on 71/74 front end section harness being needed to source are of course beams, parking lights, top fender turning lights. On 73/74 a change made was adding the horns on that harness section. 74s got the washer pump also added on that harness
Only diff I can think off between 71/72 and 73/74 for the forward lighting harness is some provision for the conceleaded lights setup like the ground for the motor AND headlights washer system ( just optioned on 71, and really weird ), which it was vacuum actuated BUT.... the washer ?