Finding ground on a Rockster

[MoraleHazard]

I'm trying to install a TomTom Rider and cannot seem to get a good ground on the Rocker. Anyone have any idea?

Thank you.

John

[johnnyjs1]

If sitting on the bike, look at the left side of the frame in front of the battery, there is a place that already has a wire grounded to it, I removed the screw and grounded my zumo to it, and tightened it again. I assume its ok, since it is already being used as a ground(forgot for what though) and has been working fine for a few months.