Real dilemma now. Electronic shop said the N29 had issues, would cost $320 to repair with no guarantees. Opted for a used one instead. Put it in and fuse blew again. Now have a used Klima relay coming. Had removed the two wires from the high / low pressure switch on the receiver dryer to prevent compressor from running (easier to get at than clutch switch?) but fuse still blew so hoping it's the Klima relay! German technology. Even 1987, way beyond my abilities