Originally Posted by Scalf77
I believe the burnt relay is the "Trailer Tow Relay, Battery Charge" The fuse listed for Trailer Tow Relay is F1.8 (it is a 40 amp fuse). It could be why the 30 amp relay sacrificed itself. I suspect that it is possible that SMB tapped into this relay to run your lights. It should supply power when running.
That's EXACTLY what that burned relay is. There are 4 power taps to the other side of that fuse/relay, so I would assume SMB pulled power from one of those taps for the spots
#1 under hood / driver side / on main loom / close to water reservoir.
#2 driver side kick panel, on the trailer brake controller harness.
#3 B pillar, close to the floor, right behind seat-belt.
#4 Just before rear trailer harness, on frame rail.
I know that wiring inside out, I've studied it enough...
BTW, #1 is right next to the High Idle wire loom. Not sure if that's any relation to your high idle not working or not.
But pulling from #2 makes more sense considering inside switch and hopefully another relay and fuse.