Electrical question on my Vintage Trailblazer camper

Yeah i started guttting it today, there is a box were i can access the electrical and i can see all the wires running under the trailer, like is aid this thing was sitting for liek 30 years, and all the wires were just shoved int he hole and filled with caulk.. lol prolly got water damage at 1 point and they just sealed it up.. Im going to put some pictures up soon. my wife has been taking pictures for a before and after type thing.


But the answer i was looking for was the motor base plug.