19 is when they switched to better wiring. I have an 18 also. I spent 2 days cleaning and lightly dielectric greasing connections. An acid brush works great to paint the terminals. I did all of this to prevent a problem down the roadDo I not need to replace relays on an 18'?
I'm going to check connections on everything I can get to anyway but I thought all the wiring updates were 2019. No?