Boat trailer wiring harness

[catsmeow]

Replacing wire harnesson boat trailer and truck. Truck side done and tested with led plug in tester, all good.
Question on trailer side, Wires pretty chaffed up and had to cut close to tongue. Have four wires going back, green which i know is right directional and yellow left directional. When I seperate the wires have a half green half brown and half yellow half brown. I'm assuming those combo's are wired together to brown on plug for running lights ( tail and side markers). Help greatly appreciated.