Tool Briefing

Tool Briefing: Charge Light Check-out

  • Bosch

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    Midtronics

    With lights and the blower turned on, a battery tester will provide some charging current information

  • Clore Automotive

    This battery tester will also check charging system voltage and print the test results

  • Associated Equipment

    Load testing is the easiest way to check charging current

  • Electronic Specialties

    A low current probe will measure key-off battery draw, and this one has the range to measure charging current too.

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The trouble code in this customer’s vehicle, P1638, indicates incorrect charging voltage. Any time you examine a charging system that’s controlled by the Powertrain Control Module (PCM), the very first tool you need is a service information system. Different battery technologies require different charging voltage, and the charging system may be programmed to work only with the factory-installed battery type. For conventional flooded lead/acid batteries, the charging system would be...
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