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Coil Current Draw Test

WARNING: This page is about a different car, the 2007 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify the battery state of charge. Refer to DIAGNOSIS AND TESTING .
  2. Connect an ammeter (0 to 10 ampere scale selected) in series with the clutch field coil feed terminal using back probe tool 6801. Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the clutch coil.
  3. With the A/C-heater control in the A/C mode and the blower motor at low speed, start the engine and allow it to run at a normal idle speed.
  4. The A/C clutch should engage immediately, and the clutch field coil supply voltage should be within two volts of the battery voltage. If the field coil supply voltage is OK, go to step  5. If the field coil supply voltage is not within two volts of battery voltage, test the clutch field coil feed circuit for excessive voltage drop and repair as necessary.
  5. Refer to the A/C Clutch Field Coil Specifications chart for the acceptable A/C clutch field coil current draw. Specifications apply for a work area temperature of 21° C (70° F). If voltage is more than 12.5 volts, add electrical loads by turning on electrical accessories until voltage reads below 12.5 volts.
    • If the A/C clutch field coil current reading is zero, the coil is open and must be replaced.
    • If the A/C clutch field coil current reading is above specifications, the coil is shorted and must be replaced.
A/C CLUTCH FIELD COIL SPECIFICATIONS

A/C Compressor Current Draw Coil Resistance
Denso 10S17 3.3 amps @ 11.5 - 12.5 volts 3.6 ± 0.2 ohms
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