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.