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Wiper Motor Current Draw Test

  1. Remove wiper fuse. Connect a 0-30 amp ammeter across fuse terminals. Turn ignition switch to RUN position and wiper switch to HI position. Ammeter reading will fluctuate. Observe lowest reading.
  2. If ammeter reading is less than 5 amps, replace wiper motor assembly. If ammeter reading is greater than 5 amps, replace wiper blades and repeat test. If ammeter reading is now less than 5 amps, wiper blades were defective.
  3. If reading is still greater than 5 amps, disconnect linkage from motor crank and repeat test. If ammeter reading is less than 5 amps, linkage is binding. If ammeter reading is greater than 5 amps, replace wiper motor assembly.
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