73 Harvester 1110 wiring diagram

The best way to get that info is to buy a Factory Service Manual form the good folks who run this forum. The whole manual is very well done, it's one of the things I like about IH.
 
I have this copy of the 1972 and 1973 wiring diagram.
 

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  • 1972 and 1973 1010-1510 Wiring Diagram.PDF
    3.7 MB · Views: 344
Gotta be your grounds at each of the non-func light housings to affect only one side. Vehicle light wiring is not side specific except for turn signals. Tail lights are fed by one wire that travels to the rear down one side and then daisy chains over to the other side. Same with back up lights. Same with front headlights and park lights. So if you have all lights to front and rear on the same one side, the harnesses are doing their job.
 
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