When grounding, can I just ground the mirror bracket or does it have to go to the right to the antenna mount? If anybody has a w900 whats your method of grounding??
When I ground I run from the bracket to the bolt that holds the mirror frame to the door/cab,then strap the door to the cab inside the door jam.
Most use thread lock on the bolts securing mirror brackets to doors and or cabs,pull the bolts and remove that stuff with a wire brush.(Ground impedance)
Locate your cab to chassis ground(s) haven't seen a late model 900 so I cant comment on KW's grounding efficiency? Most likely more then one source has been provided and should be sufficient for the task at hand.