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Old 2nd March 2011, 09:55 PM
Acat Acat is offline
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Low fuel light thermistor

Trying to understand the thermistor in the gas tank for a project I'm working on. When the fuel level exposes the thermistor does it go open or closed? Or does it give a resistance value? Is it just controlling the ground???? TIA
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Old 3rd March 2011, 11:31 AM
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Originally Posted by Acat View Post
Trying to understand the thermistor in the gas tank for a project I'm working on. When the fuel level exposes the thermistor does it go open or closed? Or does it give a resistance value? Is it just controlling the ground???? TIA
Thermistors change resistance with temperature so it should give a resistance value depending on if it is covered up or exposed. The resistance is higher when colder ie covered up with gasoline and lower when warmer when exposed in the air. Don't know the values though.
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Old 22nd April 2012, 08:56 PM
roust84 roust84 is offline
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In this particular case I thought it was acting as more of a switch. Open when cool and closed when warm (exposed to air).

The test procedure in the manual just uses a light bulb and power source. Light on when exposed to air. Light off when dumped in water.
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Old 23rd April 2012, 12:24 AM
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Not a switch. Variable resistor, NTC or PTC thermistor. Certain current equals ON or OFF. I haven't checked with a DVM yet, so I'm not sure. The service manual just uses a power supply and a lamp.
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