1983 Chevrolet Sportvan G10, 5.7 LFACTORY OEM SERVICE PROCEDURE

Undercharged Battery

  1. With ignition switch "ON", connect a voltmeter from alternator "BAT" terminal to ground, then from No. 1 terminal to ground, and last, No. 2 terminal to ground. A zero reading indicates an open between connection and battery.
  2. Opens in the No. 2 lead may be between terminals at the crimp between harness wire and terminal, or in wire. See Fig 1.
    NOTE: If preceding test is satisfactory, continue to next step.
  3. Disconnect battery ground cable. Connect an ammeter in circuit at "BAT" terminal of alternator.
  4. Reconnect battery ground cable. Turn on all available accessories. Connect a carbon pile across battery. Operate engine at moderate speed and adjust carbon pile as required to obtain maximum current output.
  5. If ampere output is within 10 amps of rated output as that stamped on the alternator case, the alternator is good. Refer to the ALTERNATOR OUTPUT SPECIFICATIONS  table.
  6. If output is not within 10 amps of rated output, ground field winding by inserting a screwdriver into test hole. See Fig 1.
    Fig 1: Delcotron Terminal Locations & I.D. (All Models) Visually inspect all terminals for clean and tight connections.
    G10028
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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