Cummins/Onan B43 / B48 — Battery Jump Starting
Operation
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Before you start
- Overcranking the engine can cause starter damage. Allow 5 minutes for starter to cool if engaged for longer than 30 seconds.
- Electrical arcing can cause severe personal injury. Do not allow positive and negative cable ends to touch.
- Jump starting a battery incorrectly can cause battery to explode. Do not smoke or allow any ignition source near the battery, and do not jump start a frozen battery.
Procedure
- Disconnect engine load.
- Use a battery of the same voltage (12V) as is used with your engine.
- Attach one end of the positive booster cable (red) to the positive (+) terminal of the booster battery; attach other end to positive (+) terminal of engine battery.
- Attach one end of the negative (-) booster cable (black) to negative (-) terminal of booster battery; attach other end to a solid chassis ground on your engine.
- Turn ignition switch to ON to start engine.
Tools required
- booster cables Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Use a battery of the same voltage (12V)
Full service-parts list: Cummins/Onan B48 →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.