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85 cj7 jeep voltage gauge not working
85 cj7 Jeep, turn on the ignition switch when the car is stationary, and the voltmeter indication is normal, but when the car starts to drive, the voltmeter pointer will swing to zero. Fault inspection; Start the engine, connect a DC ammeter between the positive pole of the battery and the wire, and check the charging condition of the generator. The charging current is about 12A, and the charging current will not change when the car is driving slowly. However, when the ignition switch is turned on and the trolley moves forward , the voltmeter still swings to the low position, but the discharge current on the ammeter does not increase . Repeated tests are the same. Then remove the instrument panel and check all plugs to ensure that they are not disconnected or loose; Use a voltmeter to test the voltage. If the voltage is normal when the vehicle is stationary, a large voltage will be generated when driving.
The charging condition of the 85 cj7 jeep is indicated by the voltmeter, which also displays the power supply voltage of the whole vehicle. At the same time, the ground wire of the instrument panel of this type of vehicle is on the body, while the ground wire of the battery is directly connected to the engine. In this way , there must be a reliable ground wire between the engine and the body to ensure the normal operation of the electrical equipment on the vehicle. This is precisely because the grounding wire of the vehicle is open circuited . When the vehicle is stationary, the engine contacts with a certain point of the vehicle body , and the voltmeter can indicate normally. When the vehicle body moves (driving or pushing) , the contact point will be disconnected, and the voltmeter will stop working because of the negative pole open circuit . At this time, the voltmeter pointer will swing to the zero position .
In case of instrument failure, if two or more instruments do not work at the same time, first check whether the instrument fuse and power regulator have failures; If a single instrument does not work, first determine whether the fault is in the sensor or the instrument. If confirm the 85 cj7 jeep voltage gauge not working any more , can replace a new voltage gauge from us.
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