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B48G — BASIC TEST

For the B48G.

Procedure

  1. Battery
  2. Make sure alternator stator leads are not shorted
  3. Be sure regulator-rectifier has a good ground
  4. Never reverse the battery leads.

Source: manual:965-0757_Onan_B43E_spec_A-D_B43G_spec_A-D_B48G_spec_A-G_Engine_Service_manual_06-1988.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.