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Regulator Circuit "S" Test

  1. Unplug wiring harness connector from regulator. Connect jumper wire between regulator terminal "A" and terminal "A" of harness connector. Connect a jumper wire between regulator terminal "F" screw head and ground on alternator rear housing. See Fig 1.
  2. Start and idle engine. Measure voltage at terminal "S" and at terminal "I" of wiring harness connector. Voltage at terminal "S" should be approximately half that at terminal "I". If voltages are normal, remove jumper wires. Replace regulator. Repeat LOAD TEST.
  3. If voltage at terminal "S" is not approximately half that at terminal "I", repair faulty wiring circuit or replace alternator. Reconnect regulator harness. Repeat LOAD TEST to confirm repair.
Fig 1: Testing Regulator Circuit "S"
G91E13429Courtesy of FORD MOTOR CO.
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