You have 1 of 2 options:1,Replace your OBC: You can replace the OBC by buying and installing a new one. It’s not super involved to replace the OBC and can be done in just a few simple steps. 2,Replace your Charger: Buy a Lester Summit On-Board Battery Charger that bypasses the OBC completely: This is the preferred option for most folks as it requires no real work. You simply take it out of the box, place the ring terminals on your batteries, plug it into the wall and you’re good to go. The Lester Summit On-Board charger bypasses the OBC completely by wiring directly to the batteries. No need for a receptacle, 3-pin plug or replacement OBC. 48V Onboard Battery Charger.