Mercury Grand Marquis owners have reported 2 problems related to battery cable (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Grand Marquis based on all problems reported for the Grand Marquis.
First tried the hazard warning lights while parked on the side of a highway and they did not work. When I drove off I put the headlights on and turned on the windshield wipers. When I got home I turned off the wipers and the headlights but the headlights stayed on. I disconnected the battery cable and 2 days later I drove to the Ford dealership. While driving I noticed that my turn signals were not working. When I got to the dealership I pointed out these problems to the service manager. I left the car and they diagnosed a bad light control module. My car is 2008 Mercury Grand Marquis LS with 57,628 miles. They charged me $740 to replace the module. I researched recalls and I saw a recall 15s39 with # 15v861000 for this exact problem but it only applied to these same cars thru cy 2005. My car is a 2008. I talked to the dealer and the Ford customer representative at 866 436 7332 and they said the NHTSA determines the effected VIN number vehicles. There is also a Ford customer satisfaction program 14n01 which dealt with this settlement for vehicles thru cy 2005. I believe they extended the warranty for the lcm module for 15 years and 250,000 miles for the effected vehicles thru cy 2005 and they even recompensated customer's who paid for exorbitant repair bills for the light control module. My dealer invoice # is 460317 with kelly Ford, inc, 776 s. Magnolia Ave, melbourne, FL. 32935 (321) 254-4283.
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1997 Ford Grand Marquis - occasional interruptions in electrical power were occurring with the radio going off, the low fuel level light going on, and the battery meter dropping. After replacing the battery the interruptions continued until finally the battery cables caught on fire. I turned off the ignition and by this time the insulation on both the positive and ground cables had completely burned off and the battery continued to supply current. I knocked off the ground terminal and dosed the fire with water.
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