Please help Me.."Overcharging"?

If the VR has a painted case, remove the paint on the back side at the bolt hole.

If its got a chrome case be sure the surface is clean of clear coat or the firewall of paint.

Use star washers on the mounting bolts.

Holes on firewall stripped ? Punch (not drill) new starter holes (ice pick) then let the self tapping bolts cut new threads.

The VR case grounds the regulator on the 2 wire system.