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Alternator Regulators - HITACHI: Adjustment

  1. Disconnect and remove voltage regulator from vehicle. If contact points are roughened, smooth with fine sand paper. Check and adjust gaps: core gap first, then point gap.
    NOTE: Adjustment of yoke gap is unnecessary on some models.
  2. Adjust core gap by loosening screws attaching contact set to yoke. Move contact set upward or downward as required. Adjust point gap by loosening screw attaching upper contact. Move upper contact up or down as required to set gap to specification.
  3. Adjust regulated voltage by means of adjusting screw. Turn screw in to increase regulated voltage or out to decrease voltage. When correct voltage adjustment is obtained, secure with lock nut. When adjustment procedure is complete, reinstall regulator and perform on car check.
    VOLTAGE REGULATOR SPECIFICATIONS

    Regulator Battery Voltage Regulated Voltage Voltage Coil Resistance (Ohms) Yoke Gap Core Gap Point Gap
    TL1Z-79 12 14.3-15.3 10.5 (1) .024-.039" .012-.016"
    TL1Z-58 12 14.3-15.3 10.5 (1) .024-.039" .012-.016"
    TL1Z-66 12 13.5-14.5 10.3 (1) .024-.039" .012-.016"
    TL1Z-74 12 14-15 10.3 .035" .024-.039" .012-.016"
    (1) No yoke gap adjustment required.
    CHARGE RELAY SPECIFICATIONS

    Regulator Released Voltage Voltage Coil Resistance (Ohms) Yoke Gap Core Gap Point Gap
    TL1Z-79 4.2-5.2 (2) 37.8 (1) .032-.039" .016-.024"
    TL1Z-58 4.2-5.2 (2) 37.8 (1) .032-.039" .016-.024"
    TL1Z-66 5 (3) 31.9 (1) .032-.039" .016-.024"
    TL1Z-74 8-10 31.9 .035" .032-.039" .016-.024"
    (1) No yoke gap adjustment required.
    (2) Measured at "N" terminal.
    (3) Measured at "A" terminal.
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