2000 KENWORTH T800B Electrical Systemwiringinteriorunder Dash Problems

TRACTOR NAN FULLY LOADED BELLY DUMP TRAILER WERE DESCENDING AN APPROX. 11% GRADE ON GRAVEL HAUL ROAD WHEN ENGINE QUIT. WITHOUT POWER STEERING OR ENGINE BRAKES, TRUCK LEFT THE ROAD AND DROPPED DOWN A 50+ FT. EMBANKMENT, ENDING UP ON THE DRIVER'S SIDE OF THE CAB, INVERTED, IN AN ICY STREAM. THE CAB BEGAN FILLING WITH SMOKE. INJURED DRIVER ABLE TO PUSH OUT CORNER OF WINDSHIELD AND ESCAPE BEFORE CAB CAUGHT FIRE. INVESTIGATION AFTER RECOVERY OF TRACTOR FOUND TWO WIRES GROUNDED OUT IN CIRCUIT TO TURN SIGNALS AND RADIOS. LOCATION IN TELESCOPING STEERING COLUMN, AT ANGLE FOR ADJUSTING WHEEL. WIRES PINCHED, INSULATION RUBBED OFF, AND WIRES GROUNDED OUT, STARTING FIRE. SITE IN AREA COVERED BY COWLING, NOT VISIBLE. IN AN AREA NOT REQUIRING MAINTENANCE OR OTHER WORK. TRACTOR HAD SHORTING OF THIS CIRCUIT RECURRENT FROM DAY OF PURCHASE. ATTEMPTS TO FIX BY KENWORTH UNSUCCESSFUL. PRIOR ENGINE STOPPAGES WERE TEMPORARY; ENGINE...