Edit: got to the shop messed with it. Those are in fact axle dump wiring harnesses.
Got a spread axle tandem I’m starting to restore.
the front and rear axle had these 3 wires on each axle rolled up hidden away and it looks like both have their own valves.
Would they maybe be for axle dumps? No experience in building these spreads thought someone here might know
will update today with a better picture after I get to the shop: