Must be power divider. It makes a noise near the transmission. I’m going to look at it again tomorrow. The fifth wheel unlock was my first guess. Owners say it definitely isn’t that. I think it originally had one. The switch won’t move. Like it’s glued in place. 2 more similar switches that are operable. 1 air slide fifth wheel and 1 dump valve. That leaves only the power divider. Electric switches only work with key on. All new to me. Thanks everyone.
Any came across these codes Vehicle ECU code-Mid 144 psid 230 fmi 4, Mid 144 sid 231 fmi 2 Engine ECU code-Mid 128 psid 201 fmi 9,Mid 128 sid 231 fmi 2 Transmission ECU code-Mid 130 sid 231 fmi 2 Brake ECU-MID 136 SID 1 FMI 1, MID 136 SID 77 FMI 7, MID 136 SID 231 FMI12, MID 136 SID 231 FMI 2
