I am not sure how common knowledge this is but, I was able to get free access to Cummins quickserve. For anyone who is unaware what quickserve is, it is the ultimate source for any info on any Cummins engine that exists. It is all service manuals, owners manuals, type in esn and it basically gives you a birth certificate. It has full wiring diagrams. And you know all the info is legit because it is from Cummins. This service used to always be a subscription so I am unsure how long it has been free. You can have access to a total of 5 engine manuals before it starts costing. When you register is called Limited Owners Plan.