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ford Lincoln speedometer needle problem
The pointer of the speedometer on Ford Lincoln car does not move, indicating 0 position maintenance. For Ford Lincoln with a mileage of more than 310000 km, the starter does not turn after the overhaul. After the starting problem is solved, the pointer of the speedometer does not move during driving and always indicates zero. Analysis of the malfunction of the pointer of the speedometer on Ford Lincoln. Since the car has just been overhauled, the problem that the starter does not turn is most likely the problem of the starter control circuit, and the main fault reason that the speedometer always indicates the 0 position should also be the problem of the speedometer circuit.
Trouble shooting of the speedometer pointer on Ford Lincoln:
Turn the ignition switch to the START position, and use a voltmeter to measure the voltage of the starter solenoid switch terminal., When the positive pole of the battery is directly connected to the terminal of the starter solenoid switch with a wire, the starter can rotate, which verifies that the starter has no fault. When the ignition switch is turned to the START position, use a voltmeter to measure the voltage of the neutral start switch terminal on the start relay, which should be 12V, but the actual measurement result is 0V, indicating that the neutral start switch, ignition switch (start gear) and related circuits are faulty. Check the neutral start switch on the automatic transmission. When the transmission is in the P and N positions, the neutral start switch path indicates that it is not the problem of the neutral start switch, so find the fault of the circuit. The inspection found that the color of the three wires of the neutral start switch plug and the socket is inconsistent, and the color of the nearby plug is also three wires, and the color is consistent with that of the neutral start switch socket. Swap the two plugs and the starter can turn.
After starting the engine, drive the vehicle for a road test and find that the pointer of the speedometer always indicates 0. Is there any wrong plug? Stop the car and check. It is found that the colors on both sides of the other connector just exchanged are also inconsistent. So we looked for the nearby line and found that the color of the three wires on a plug from the steering gear was incorrect with the plug. After connecting the two plugs interchangeably, carry out the road test. The speedometer works normally and the fault is completely eliminated. Maintenance summary of the speedometer pointer on Ford Lincoln.In order to avoid wrong wiring, connectors in close positions are usually made of different specifications or painted with different colors. The three connectors that are wrongly connected in this case are located on the right side of the engine and transmission, close to the firewall, and the plugging operation is difficult. In addition, the original direction of the harness is changed during disassembly and assembly, so that the unmatched plug is close to the socket, and the connectors are all three-terminal connectors. The maintenance personnel did not carefully identify, and thought that the plug that can be inserted is the right one, which caused the fault in this case.
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