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Home >> Mercury >> 2008 >> Milan Base, 3.0 1, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 840 (Charging System - General Information - F250-F550) >> Diagnostic Tests >> Charging System - Single Generator >> Component Tests >> Generator On-Vehicle Tests - Load Test

Generator On-Vehicle Tests - Load Test

WARNING: This page is about a different car, the 2007 Ford Pickup, 2007 Ford F550 Super Duty, 2007 Ford F450 Super Duty, and 2007 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. Switch the tester to the ammeter function.
  2. Connect the positive and negative leads of the tester to the corresponding battery terminals.
  3. Connect the current probe to the generator B+ output terminal, circuit 36 (YE/WH) (gas engines) / circuit 1119 (RD) (diesel engines).
  4. With the engine running at approximately 2,000 rpm, adjust the tester load bank to determine the output of the generator. The generator output should be greater than the graph shown below. If not, refer back to the pinpoint test or Go to Symptom Chart .
    5. Fig 1: 3G (Gas), 70/115 amps
    GF0008243Courtesy of FORD MOTOR CO.
    Fig 2: 6G (Diesel), 65/110 amps
    GF0004527Courtesy of FORD MOTOR CO.
    Fig 3: VR42 (Diesel), 95/140 amps
    GF0008244Courtesy of FORD MOTOR CO.
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