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Home›Repair guides›20 VAC. Repair the alternator as necessary if the voltage is not within the specification.

Cummins/Onan — 20 VAC. Repair the alternator as necessary if the voltage is not within the specification.

For these Cummins/Onan models: HGJAA (Spec A-E), HGJAB (Spec A-E), HGJAC (Spec A-C), HGJAD (Spec A-E), HGJAE (Spec A-E), HGJAF (Spec A-C).

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Procedure

  1. If the B1-B2 output voltage is between 15 and 20 VAC, measure the DC output voltage at the K1 B+
  2. If the DC output voltage is less than 12.8 VDC, replace the battery charge regulator.
  3. Control

Source: manual:HGJAA, HGJAB, HGJAC, HGJAD, HGJAE, HGJAF Service Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.