Glad I stumbled upon this, I’m having a slightly similar issue; unfortunately, while on a roadtrip with my family for the holidays. 2015 Ram 2500 Tradesman. Mine is intermittently flashing the SRS light when the seatbelt indicator comes on while driving and I hit a bump or adjust my position on the seat cushion. I have tried to duplicate it while parked, but can only get the seatbelt indicator to flicker. I found when jockeying the harness for the seatbelt buckle I can get the seatbelt lamp to go on and off. And while driving if I reach my hand down and grab the harness it causes the SRS and seatbelt indicator to come on and off. I am suspicious it’s going to come down to the seatbelt switch being the root cause, but without some wiring diagrams I’m not 100% sure. There are two SRS plugs under the driver seat (yellow connector body) as well as a few grey plugs, I have unplugged and checked for corrosion and reseated everything. I’m going to try and dissect further once I get back home and have better access to tools and wiring diagrams. I’ll keep ya posted if I find a solution.
