Relay clicks but no light indicates no main power since the relay uses the same ground...main power would be the green/white wire from the fuse box. Could be a bad connection at the relay, could be dodgy at the multipin connector, might be a blown fuse since it is a seperate fuse for the lightbar. First you'll have to check and see if raw power is showing up at the green/white lead at the relay. Got power? No= blown fuse. Then when the relay is engaged you should see power at the blue/white lead. Got power? If yes, that=bad light ground, no=bad relay.
