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](https://www.sbmar.com/wp-content/uploads/2017/05/MUS-Jumper-Q-Series.jpg)
![Cummins Marine Multiple Unit Synchronization (MUS ID) Jumper Plug](https://www.sbmar.com/wp-content/uploads/2023/10/Cummins-Marine-Multiple-Unit-Synchronization-MUS-ID-Jumper-Plug-240x240.png)
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