dennis112
15 Year Member
Your sending unit started at 10 ohms and started rising? Not possible. Either he meter leads are not making clean contact with the parts or the meter/leads are kaput. Also, DO NOT let your fingers stray onto the metal part of the ohm meter probes as that definitely affects the readings as will the leads NOT making good clean contact with the parts.
You do not have to remove the sending unit from the motor in order to ohm it BUT you should have removed its wire. Simply put one meter lead on the SU stud and the other to its outer case. The reading will be the same on or off the car. The SU measured resistance should definitely be higher than 10 ohms when the motor is off.
The 22 ohm reading in post #19 was also a steady reading on my car. I tried different objects for the ground lead (sending unit case, the aluminum valve covers, even my hood pin studs) and the wire-to-gauge measurement remained at 22 ohms.
You do not have to remove the sending unit from the motor in order to ohm it BUT you should have removed its wire. Simply put one meter lead on the SU stud and the other to its outer case. The reading will be the same on or off the car. The SU measured resistance should definitely be higher than 10 ohms when the motor is off.
The 22 ohm reading in post #19 was also a steady reading on my car. I tried different objects for the ground lead (sending unit case, the aluminum valve covers, even my hood pin studs) and the wire-to-gauge measurement remained at 22 ohms.