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Good question! Here is the verbiage from Minn Kota: CAUTION – Because the body of the battery charger is metallic, do not directly mount the charger to the hull of an aluminum boat. Use a means of isolation (such as wood or plastic) to prevent the charger body as well as mounting fasteners...

In the instructions, it says not to mount the metal charger directly against the aluminum because it can cause electrolysis. I've seen suggestions to use nylon spacers to keep the metals from touching. Make sense?

First time boat owner here. I have an Alumacraft MV 1648 NCS. For now, I'm just running a transom mount 70# MK TM and may get an outboard down the road. I bought a MK 210D onboard charger and need help in the installation. It's pretty heavy so I'd like to use nuts/bolts instead of screws for...