2004 FORD F-250 4X4 SUPERDUTY 6.0L DIESEL - ENGINE FIRE. CAUSE: NEGATIVE BATTERY CABLE VIBRATED LOOSE AND CAUSED GROUND ON A/C TO OVERHEAT AND CATCH THE A/C HOUSING ON FIRE. FIRE RESULTED FROM ATTEMPT TO START THE VEHICLE IN THE OWNER'S DRIVEWAY ON A COOL DAY. VEHICLE WAS TOWED TO LOCAL DEALERSHIP AND REPAIRED ($1250). THE REPAIR INCLUDED TACK WELDING THE NEGATIVE CABLE TO THE ENGINE BLOCK. A FEW MONTHS LATER, A RESISTOR IN THE A/C BLOWER HAD TO BE REPLACED. THE DEALERSHIP CLAIMED IT WAS UNRELATED AND THE REPAIR WAS AN ADDITION $114. *TR