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Old 17-08-2013, 04:27   #1
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As simple as possible wiring for a Cummins BT

I have inherited a 4BT Cummins which had a very complicated wiring harness with every sensor knows, junction box, electrical controls for windlass, hydraulics etc. the harness is a real rats best.

I want to strip it out to the most minimal electrics. Any suggestions for best texts or diagrams that a fool can follow.

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Old 17-08-2013, 06:04   #2
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Re: As simple as possible wiring for a Cummins BT

You can purchase a maintenance/installation/shop manual manual from Cummins or go online to their website and download the PDF of the engines electrical schematics. After a certain point in time, Cummins stopped publishing the physical books which makes one reliant on the PDF's.

I would be very careful with what you strip out. Depending on how old the engine is, it may have a number of things which are absolutely critical such as the Engine Control Module, which cannot be removed from the engine and still have the engine work. You of course will also need oil pressure and coolant temperature and the alarms for both. You might also have an electric fuel pump and a fuel flow meter, which are very helpful to have. You might also have a temperature sensor and pressure sensor for the transmission. The engine might also have a Smart System display, which if not installed will not allow the engine to work.

It all depends on the engines age as to how complex the engines electrical system has become and how reliant the engine is on its electronics. Cummins had to do this in order to meet Tier 2 pollution standards.

I am on my second set of Cummins engines now. The complexity is actually a good thing. They are much more efficient, cleaner burning, smoother and quieter than were the non Tier 2 engines. They have also been very reliable.

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Old 17-08-2013, 06:10   #3
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transatlantic diesel in va sells these and are very helpful. May be worth a call.
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