![]() ![]() This will keep you from making sparks with your tools while you’re fumbling around under the dashboard. Loosen the battery ground cable clamp (usually a 10-13 mm nut) and disconnect the cable. Step 1: Disconnect the battery ground cable. Part 1 of 3: Removing the instrument cluster Chances are, if your car was made after 1998, it has a computerized dashboard and doesn’t use a separate regulator. ![]() Look in your workshop manual in the instrument section to determine if your car uses one that can be changed. So the designers put a voltage regulator (sometimes called a stabilizer) in the system to control the voltage to the instruments. If the voltage at the gauge is just a little high or a little low, it can give an inaccurate reading. The amount of voltage that can move through the sensor determines the position of the needle on the dial. The gauges work by applying a voltage to a variable-resistance sensor. The gauges were the only devices in the car that required precision voltage regulation. On older cars, the system voltage could vary and would normally be as low as 12 volts right after startup to 14.8 volts when the car is moving down the road. When the instrument cluster is dim or erratic, and especially when it is completely inoperable, there may be a common cause: a failing instrument voltage regulator. Maybe you noticed that your temperature gauge seems to be reading high, even when the car has only just been started. So, you just filled up with gas, and the gauge only reads ¾ or you ran out of gas when your gauge said you still had a quarter tank.
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