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Cummins/Onan — 19

For these Cummins/Onan models: EGMBT, EGMBT (P4500), EGMBU, EGMBU (P5000E), EGMBU (P5000e), P24500 (Spec A), P5000e (Spec A).

Applies to: Cummins Onan Egmbt, Cummins Onan Egmbu

Procedure

  1. 4. Starting and Running the Generator Set 10-2009
  2. 4.6 Charging Batteries To reduce arcing, always stop the generator set before connecting or disconnecting the battery to be charged. Connect the battery to be charged to the DC terminals on the control panel. Make sure polarity is correct: positive (+) to positive (+); negative (–) to negative (–). WARNING: Ignition of explosive battery gases can cause severe personal injury or death. Arcing at battery terminals can ignite battery gases. Ventilate the area before working on batteries. Wear safety glasses and do not smoke. Always stop the generator set before disconnecting the battery. Always disconnect the negative (–) cable first and reconnect it last. NOTE: The battery on electric-start models has its own charging circuit and therefore must not be connected to the DC charging terminals.
  3. 4.7 Circuit Breakers FIGURE 9. AC AND DC CIRCUIT BREAKERS If too many tools or appliances are connected, or a tool or appliance fails due to a short circuit, one or more of the AC or DC circuit breakers on the control panel will trip. Disconnect or turn off as many tools and appliances as possible and reset the circuit breaker by pushing the reset button back in. (It takes at least 10 seconds after tripping to reset.) Turn on or reconnect only as many tools and appliances as the generator set can power. A tool or appliance probably has a short if it causes a circuit breaker to immediately trip when connected. WARNING: Short circuits in faulty electrical tools and appliances can cause electrocution or fire. Read and follow the tool and appliance manufacurer's instructions and warnings regarding use, maintenance, and proper grounding.
  4. 4.8 Grounding FIGURE 10. EARTH GROUND LUG 20 914-0508 (Issue 5)

Source: manual:914-0508 Onan EGMBT P24500 EGMBU P5000e (spec A) Portable Genset Service manual (10-2009).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.