Bought an old 2000 Taurus key had been broken off in ignition I had a lock guy get it out and make new keys and reset the security system I also replaced the fuel pump and starter relay and battery it wont start
If the security system has been reset ( no light on/flashing ) you may have a neutral safety switch problem, Will the vehicle crank over in neutral? In most cases, the neutral switch grounds the starter relay and allows it to operate. Does the starter relay connector have 2 powers? One constant and one with key on/cranking? If these power supplies are there, suspect the ground side of the relay to be the problem and possible neutral safety switch
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