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12.7 Detroit

funwithfuel

Senior Member
Joined
Mar 7, 2017
Messages
5,519
Location
Will county Illinois
Occupation
Mechanic
Should be 2 fuses. 1 for each set of 3 cylinders. If you lost 1 it shoulda kept running on 3. If you dont have any error codes, pull the sir compressor discharge hose off. Crank the engine and see if you get delivery. If the accessory drive fails you lose compressor and fuel pump. Dragged a lot of Freightliner off the highways for this common problem
 

LN Pipeline

Well-Known Member
Joined
Feb 21, 2019
Messages
150
Location
Montana, USA
My neighbor had this problem with a 12.7. Ended up being low coolant. Guess there is a shutoff switch for this?

I don’t know if your problem is that simple, but you could check.
 

crane operator

Senior Member
Joined
Mar 27, 2009
Messages
8,275
Location
sw missouri
Will it crank, but just not start, like its out of fuel but you have fuel? Mine had a rubbed through wire behind the air compressor. I think its the wire that ran from ecm to crank sensor on the front of the engine.
 
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