battery tender

Hey guys, I recently purchased a 2022 mustang GT and was setting up the battery tender using the fuse box as seen in these two pictures. Fuse Box / Ground. While installing the positive cable to the fuse box the lights flickered a few times and the fuel pump cycled 4-5 times until the bolt was...

I have a Battery Tender (Deltran) original 25 feet quick disconnect extension cable. It is new, in box. I am asking for $25 shipped (or $20 picked up).