I have a deep cycle battery mounted under the seat and I have been thinking about putting a battery tender on board permanently or at least the plug in to keep from having to pull seat every time to charge , which is getting to be more often since I use the stereo in it for shop radio and I’m in the shop more now lol. My question is can I connect the charger wires to the isolator connection for the second battery and not damage the factory battery? I have searched and found a lot of info on charging both batteries but nothing that really helps me. Thanks.