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Setting the MUS ID Jumper on Cummins Marine “Q” Engines

Setting up the MUS (Multiple Unit Synchronization) ID Jumpers on Cummins Marine engines allows the CAN network to properly identify the Starboard and Port engines (which are termed MASTER & SLAVE respectively). 

The MUS ID jumper is a 4-pin Deutsche plug located somewhere on the on-engine harnessing. The connector will have a looped wire that tells the engine whether its the master or slave. When pin positions 1 & 2 are jumped together, the engine will be setup as the MASTER (typically the STBD engine). To setup an engine as the SLAVE engine (typically the PORT engine), wire positions 1 & 3 need to be jumped together.

MUS Jumper Q Series
MUS Jumper Q Series