It’s an older charger; probably at least 10yrs old… well My other half somehow managed to smack into this with our riding mower. The internal wires tore out & I’m not 100% sure where they go back to. I assume the black one goes to the grounded rivet in the pic. But would anyone please if you have this model battery charger, pull the cover off & take some pics for me as to where they all go, I would really appreciate it!