Hank I did not fasten the bus bars down with exterior screws this time. The wires are heavy gage and hold them in place and separated. I coated everything with terminal conditioner. Those mounting screws go into the panels that attach to a bar that screws into the trailer frame and therefore a very close potential as the negative solar leads are referenced to chassis ground in the solar controller. So electrically, the screws would look like the bus bar that had the most corrosion. That being the case, I suppose they would corrode the same and in fact looked the same. In any case , I will inspect in a month or so and if the process has started, I will replace those screws with nylon screws just to eliminate that possibility.
Thanks all. Now that I am aware of the problem, I'll keep an eye on it. I am hoping the terminal conditioner will interrupt the process by elimating one of the three essentials. Only time will tell.
Sent from my SM-G935P using Tapatalk