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Current Output Test

  1. Ensure battery is charged. Turn ignition off. Disconnect negative battery cable. Connect a 0-150 amp DC ammeter and a voltmeter to vehicle charging system. See Fig 2 and Fig 3 .
  2. Connect a carbon pile rheostat between battery terminals. Ensure carbon pile is in OFF position before connecting leads.
    CAUTION: Generator has 2 field terminals. In step 3), DO NOT  connect jumper wire to generator field terminal Dark Green/Orange wire (Dark Green/Black wire on Grand Cherokee).
  3. Connect one end of jumper wire to ground and other end to generator field terminal Dark Green wire on rear side of generator. See Fig 1 . Connect negative battery cable.
  4. Start engine and reduce engine speed to idle. Adjust carbon pile and engine speed until engine speed is 1250 RPM and voltmeter reads 15 volts. DO NOT  allow voltage to read greater than 16 volts.
  5. Ammeter should read within 10 amps of rating listed on back of generator. If reading is not as specified, replace generator. Remove all test equipment.
Fig 1: Identifying Generator Terminals (Typical)
G95H26812Courtesy of CHRYSLER CORP.
Fig 2: Testing Generator Current Output (Cherokee & Wrangler)
G94J65440Courtesy of CHRYSLER CORP.
Fig 3: Testing Generator Current Output (Grand Cherokee)
G95G26811Courtesy of CHRYSLER CORP.
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