The harness comes with an inline fuse pre-installed. Call us in case you are trying to find a Supra Adapter to hook up with the inventory battery harness (2023 design Sur-Ron and before only). The BtrPower 72V Ebike Battery provides strong efficiency for motors ranging from 1800W to 2500W. https://sur-ronultrabeer08383.affiliatblogger.com/89816587/about-sur-ron-ultra-bee-weight