Cummins/Onan — Changing fuse to negative battery lead
Repair & overhaul · Battery fuse
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
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Before you start
- For positive ground battery: If the battery is positive ground, the fuse in the Instapac MUST be changed to the negative lead.
Procedure
- Remove the four screws holding panel on which battery input terminal blocks and fuse are mounted.
- On rear of this panel a jumper wire connects one end of fuse holder to the battery positive terminal block. Disconnect this wire at the positive terminal block only.
- Disconnect wire at the other end of fuse holder and connect to the positive battery terminal block.
- Disconnect wire from the negative battery terminal block and connect to fuse holder.
- Connect jumper wire removed in step 2 to the negative battery terminal block.
- Reinstall panel.
Tools required
- screwdriver Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan owner's 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.