What was found
DURING ENGINE START OF THE NR 2 ENGINE A STRONG ELECTRICAL ODOR WAS SMELLED BY THE CREW AT 38 PERCENT N2. AN ELECTRICAL ARC CLOSE TO LEFT KNEE, WENT TO IDLE CUTOFF ON THE NR 2 ENGINE AND SHUT THE BATTERY SWITCH OFF, LOTS OF SMOKE AND ODOR IN COCKPIT. T/S FOUND THAT COCKPIT FLOOD LIGHT RHEOSTAT HAD AN INTERNAL SHORT. REPLACED WITH NEW PART RHEOSTAT, P/N RYGNAYSD252A, S/N NA. ALSO REPLACED AS A PRECAUTION THE FLOODLIGHT CONTROL CIRCUIT BOARD. INSPECTED ASSOCIATED FLOOD LIGHTING WIRING, ALL APPEARED NORMAL. COCKPIT LIGHTING FUNCTION CHECK NORMALLY. ALL WORK DONE IAW CESSNA 560 WIRING DIAGRAM 33-10-01 FIGURE 02.