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Valid heavy duty electrical system testing depends on all the components being in good operating condition. In addition,
the battery MUST have sufcient charge for testing. Carefully perform the following steps before attempting any electrical
diagnosis.
Inspect Belts for cracks, glazed surface and fraying. Tighten loose belts.
Inspect Battery for terminal corrosion,
loose or broken posts, cracks in the case,
loose hold-downs, low electrolyte level,
moisture, and dirt around the terminals.
If the battery terminals are corroded or
dirty, clean terminals before performing any
tests.
Inspect Starting System. Check starter, solenoid, and regulator for loose connections,
loose mounts and frayed or cracked wires.
Important Note: A damaged battery must be replaced before proceeding.
INSPECTION
VISUAL CHECK
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