how to wire water temp gauge

• 2022-04-20

Connection method of automobile electronic water temperature gauge:

1. The water temperature gauge has three lines, including main line, auxiliary line and one signal line. The signal line controls the grounding money. After the power supply line of the water temperature gauge is connected, the signal line grounding gauge will rise.

2. Finally, connect the two plug-in water temperature sensors. One end is connected with signal and the other end is connected with grounding. The signal line of the meter is f or s or E.

3. There are generally two water temperature sensors: one is the sensor of the water temperature gauge and the other is a wire, which is used to display the temperature of cooling water (or coolant) on the water temperature gauge and adjust the oil supply during startup; The other is the sensor of cooling water or coolant, which is two-wire. The sensor of coolant is used to regulate the electronic fan. When the temperature is high, the electronic fan will work.

Red or red black is connected to the positive pole of the key switch and black negative pole. Two black-and-white or two-color long wires are connected to the sensor. Install the sensor at the sensor position above the original engine.

First of all, a live wire is the positive wire into the positive end of the instrument, and a wire from the negative end of the instrument to the water temperature sensing plug. There are marks near the pile head of the watch, black grounding, yellow or white sensing plug wire. You should know that there is only one pile head.

A negative temperature measure thermistor is installed in the detector, and its resistance value will drop with the increase of temperature. When the power switch is turned on, the current forms a circuit from the positive pole of the battery → power switch → resistance R → coil L2 → divided into two circuits (one flows through thermistor 1; the other flows through coil L1) → grounding → negative pole of the battery. When the water temperature is low, the resistance value of the thermistor in the detector is large, and the current flowing through the coils L1 and L2 isn't much different. Still, due to the large number of turns of L1 and the strong glamorous field, the architecture 3 with pointer will redirect to the leftism, making the pointer point to the low-temperature scale; When the water temperature increases, the resistance value of thermistor diminishments, the shunting effect increases, the current flowing through L1 diminishments, the glamorous field force decreases, the architecture deflects to the right, and the hand needle points to the high temperature scale.