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    • Cummins Marine Forum Topics
    • B5.9 M-270 Electrical Issues

      This topic has 3 replies, has 3 voices, and was last updated byStan Johnson 6 years ago

      August 30, 2017 at 10:55 am Good Morning, I have an interesting problem that popped up on my starboard 6BT 270 last week (eng. serial number 45841642). While cruising at 1500 RPM’s all of a sudden my tach gauge started fluctuating back and forth between 1500 and 1800 RPM’s although the actual engine RPM’s didn’t change. At the same time I received a flickering low oil pressure light and flickering low voltage light for that engine. The engine was im…

      Started by: Stan Johnson in: Cummins Marine Engines


      3 Replies
      September 13, 2017 at 7:49 pm Thank you for the advice gentlemen. As it turns out, in addition to the fuel shutoff solenoid shorting out, the mag relay directly forward of the starter mag relay fried as well. A guy that ties up next to me had spares of both he gave me and after installation (including Tony’s FSS ground advice), everything works fine.

      Last Post by: Stan Johnson posted: 6 years ago

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