I'm having a problem with corrosion appearing along the long bar between the sets of batteries.
I had Interstate U2400 batteries when I got the coach. They had the proper 28 mm stems for the autofill system. The batteries were bad and were replaced with U2200 batteries, which are supposed to have 34mm stems. So, I now have shorter stems than spec'd. I asked Western RV if that would be a problem, and they said it would not, there would just be a little more water in the batteries. I can't see that the cells are leaking from the top, but could the incorrect stems be contributing to the corrosion? Any other possibilities? Should there not be ANY corrosion showing up?