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Old 03-13-2014, 05:28 PM   #1
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Mainship Cummins Engine Heater Control Unit

Our Mainship has become hard to start, and I believe that the air inlet heater grid is not being energized. I want to find a wiring diagram for the Heater Control Unit to the Heater Grid.
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Old 03-13-2014, 05:41 PM   #2
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Post that in www.boatdiesel.com and you,ll get a reply with the diagram. It is simple. Probably a bad relay.
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Old 03-13-2014, 06:27 PM   #3
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Quote:
Originally Posted by davegreene99 View Post
Our Mainship has become hard to start, and I believe that the air inlet heater grid is not being energized. I want to find a wiring diagram for the Heater Control Unit to the Heater Grid.
A quick test- locate the 2 wires on the inlet air preheater grid, disconnect the heater at the heater grid and retest. The heater grid is right below the air intake.

Or, remove this fuse:

Controlling the Air Heater Circut on your B & C Series Cummins
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Old 03-13-2014, 11:37 PM   #4
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Dave, except for wintertime runs, you can safely operate without the preheaters. I used to keep a small heater in my engine room so the ambient temp remained about 60 degrees.

Otherwise, a wolverine magnetic heater works well to keep the engine warm.
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