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Home›Repair guides›900 ohms in the other direction.

Cummins/Onan — 900 ohms in the other direction.

For these Cummins/Onan models: 15.0 HA - 21 - a, 7.5 HA - 21 - a.

Applies to: Cummins Onan 15 0 Ha 21 A, Cummins Onan 7 5 Ha 21 A

Procedure

  1. 2. Rectifiers CR2 and CR3 normally have resistance of 3700 ohms in one direction and 600 ohms in the other direction. Check transistor Q1 (three-lead component) like a rectifier. Check resistance in one direction, reverse leads and check resistance in that direc- tion. B toC - 700 ohms, infinity; B to E- 700 ohms,
  2. 2300 ohms; C to E - 900 ohms, infinity.

Source: manual:907-0500 Onan HA Auto Demand Control Service Manual (06-1984).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.