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Coil Current Draw Test

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. 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 A/C clutch field coil feed terminal. Connect a voltmeter (0 to 20 volt scale selected) to measure voltage across the battery and the clutch field coil.
  3. With the A/C-heater control in any 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 A/C CLUTCH FIELD COIL SPECIFICATIONS  for the acceptable A/C clutch field coil resistance and 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.
A/C CLUTCH FIELD COIL SPECIFICATIONS

A/C Compressor  Coil Resistance  Current Draw 
Denso 10S15/10S17 3.6 ± 0.2 ohms 3.2 - 3.3 amps @ 12V ± 0.5V
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