I just found a spot where rain was leaking inside my truck and dripping directly onto my GEM module and fuse block. I found my fuse block to contain rust/corrosion inside. A few days ago I took apart the fuse block (one layer at a time) and bead blasted it to clean up all the rust. The rust caused my interior relay to chatter off & on for a few months before the relay gave out. I also sprayed rattle can clear coat on the tracks to keep rust from coming back. I also noticed that when I reinstalled the two wire harnesses that some of the wires had not seated (I pulled the black covers off the wire harnesses to see this). I had to take a small pair of pliers to each wire that didn't seat. Now that the fuse block is clean inside and a new relay is installed, everything works great!!!
Drew