Everything is in the TIPM. All the relays are part of the PCB, and therefore aren't replaceable. The fuses are numbered 30, 29, 28, 81, 53, 11 and 87. fuse 11 is power for the trailer brake module, and 87 is run/start to the TBM. 30 is fused 12vdc, 29 is trailer tow relay output, 28 is backup lamp, 81 is right stop/turn, 53 is left turn/stop. Relays run park lamp, backup lamp, left lamps, right lamps, and power to the TBM.