Have a 7088 combine with 2 beacons on the front mirrors. There really is not much for flashers on the rear. Would like to add a 3rd beacon on the back. Looked in the engine compartment for the wire harness for factory beacon but could not find one. This combine was not ordered with beacons, they were added on after by the dealer. Can I pull power from the front beacons to run the rear so everythings off the same switch? Or is there a place to tie in on the back for a beacon?