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Alternators & Regulators - MOTOROLA: Testing

NOTE: Make sure alternator is operating properly before testing voltage regulator. See "Motorola Alternator" in this section.
  1. With engine off, disconnect output cable from alternator and connect an ammeter (0-60 amperes) in series with output terminal and cable (positive terminal of ammeter connected to output terminal of alternator). Connect a carbon pile load to negative side of ammeter and negative battery terminal, then connect a voltmeter to alternator output terminal and negative battery terminal (positive terminal of voltmeter connected to output terminal of alternator).
    Fig 1: Motorola Regulator Internal Circuits
    G09333260Courtesy of FORD MOTOR CO.
    Fig 2: Motorola Regualtor Internal Circuits (3-Lead Connector)
    G09333261Courtesy of FORD MOTOR CO.
  2. Start engine and increase load with carbon pile, and increase engine speed if required, to obtain 10 amperes output current. Operate engine for I 5 minutes to stabilize temperature, then check ambient temperature of regulator by placing a thermometer I" away from regulator case.
  3. Output terminal voltage must be within limits indicated in table, at specified ambient temperature. If voltage is not within limits, replace regulator and repeat test. Increase load with carbon pile and engine speed until rated current output is reached. Voltage at output terminal should be at least 13 volts but should not exceed maximum limits indicated in table.
    1963-64 Voltage Specifications (At Ambient Temperature)

      (1) Output Voltage
    Ambient Temp. (°F) Minimum Maximum
    0° 14.60 15.40
    20° 14.45 15.25
    40° 14.26 15.08
    60° 14.13 14.92
    75° 14.00 14.80
    80° 13.95 14.75
    100° 13.80 14.60
    120° 13.65 14.45
    140° 13.60 14.28
    160° 13.30 14.13
    (1) With 10 ampere load.
    1965-69 Voltage Specifications (At Ambient Temperature)

      (1) Output Voltage
    Ambient Temp. (°F) Minimum Maximum
    0° 14.6 15.4
    20° 14.6 15.3
    40° 14.3 15.0
    60° 14.1 14.9
    80° 14.0 14.8
    100° 13.8 14.6
    120° 13.7 14.5
    140° 13.6 14.4
    160° 13.3 14.1
    (1) 1965-69 Voltage Specifications (At Ambient Temperature)
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