transom of my little 1448 jonny....see pics.

I have a starting battery for the 25 Merc in a plastic case mounted in a aluminum holder. Connected to that battery are 2 small older locators.
There is a 12 volt battery up front for the trolling motor. There is a plug for the motor, it is not mounted in the boat. Just comes up a hole in the deck and lays on the carpet when the motor is not plugged in.

Do I have an electrolysis problem? (sorry...pics rotated when I added them for some reason)

Electo2 (1).jpgElecto2 (2).jpg