Check your wiring while you are at it. When the engine is up to temp, watch your oil pressure gauge while you turn your headlights on and off. If you get different pressure readings, you have a wiring or alternator issue.
'85 930 Factory Special Wishes Flachbau
Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, 8:41 R&P