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Generator To Battery Continuity Test

NOTE: Check generator wiring harness connections, fusible link, and drive belt tension. Ensure battery is fully charged before performing test.
  1. Turn ignition off. Disconnect negative battery cable. Remove output lead from generator terminal "B". See Fig 1 . Install a 100-amp (130-amp on Diamante) ammeter in series with terminal "B" and disconnected output lead. Install positive lead of ammeter to terminal "B" and negative lead to disconnected output wire.
  2. Install positive lead of digital voltmeter to terminal "B" and negative lead to positive battery terminal. Install a tachometer and reconnect negative battery cable. Leave hood open.
  3. Start and operate engine at 2500 RPM. Turn accessories on and adjust engine speed until ammeter indicates slightly greater than 30 amps, and note voltmeter reading. If voltmeter indicates .3 volt or less, system is okay.
  4. If voltage is greater than .3 volt, check wiring between generator terminal "B", fusible link, and positive battery terminal. If terminal is not sufficiently tight or if harness is discolored due to overheating, repair as necessary and retest.
Fig 1: Identifying Generator Terminals (Typical)
G90C08766Courtesy of MITSUBISHI MOTOR SALES OF AMERICA