Sounds like you're going to need to go in, and physically trace the wires for them. Do continuity checks to make sure a ground hasn't broken inside insulation so that it LOOKS good but isn't actually doing its job. You're gonna have to do this with all the ground wires for those. What if you disconnect the ground from the chassis and hook it straight to (-) on battery? If that makes them work them might but need cleaning up to make good connection.