Posted on March 6, 2022 by Jack BobCat 753 – FRONT AUXILIARY PRESSURE RELIEF BLOCK – Solenoid Testing Use a test meter to measure coil resistance [Figure 20-120-9]. Coil wires do not have polarity. Correct resistance is 11 ยฑ 1 ohms. Replace the test meter with 12 volt power. You can see and hear the spool shift.