Re: Need to test water temp gauge and wiring
Ensure there is some voltage at sender with wire disconnected.
Ensure sender body has a good contact (ground) with engine/intake.
With wire disconnected at sensor, measure sensor terminal to ground; high ohm value, say above 5K ohms = cold reading.
Substitute a 0-5K variable resistor to sensor wire at sensor and with lesser resistance dialed in, gauge should read closer to hot.
Ensure gauge is getting IGN or ACC voltage and the gauge itself has a good ground about its case and terminal.
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