Light Bar Repaint Question

[mgambuzza]

Removed, repainted, and tonight I'll reassemble my light bar and horn assembly tonight. Before I do this, an item came to mind and wanted to ask the people on here from past experience. I just remembered the bar probably serves as the positive ground for the lights and horn?? Do I need to sand off paint in any particular area to ensure a good ground on the headlights and horn? I wasn't sure whether that or the bolts when they tighten on the fenders and on the headlamps provide the "good enough" ground for these items.