'13 Pete cabover blower motor problems

Hey everyone. Me and my Dad recently opened mobile maintenance shop strictly for heavy duty diesels. Now neither him or I are certified mechanics though we may be considered more of your backyard variety. He is too humble to admit the extent of his mechanical knowledge and I'm simply too inexperienced. Business took off however within the first 3 months we had more work than our 2 mechanics could handle. Then life hit. One mechanic was diagnosed with leukemia, leaving us with just the one mechanic.. who is.. let's jus say inadequate [and that's a gross understatement], resulting in my old man working under the hood of our customers trucks jus to keep them happy despite having started this business to relax and spend time with my mom. Anyways i'Lloyd get to the point, our mechanic wrongly diagnosed this 2013 Pete cabover 220's inoperable a/c problems and lied about having checked if the blower motor was receiving power, so we ordered blower motor and resistor which took a week to get here, needless to say customer is not happy. So me and the old man install new blower motor to find it is not the problem, a/couple, heat, defrost, all still inoperable. No power running up top and we need this truck to be completed by morning. Now, we will happily work on it through the night if we have some kind of lead or a nudge in the right direction but like I said we are not mechanics and are truly at a loss as far as even identifying or diagnosing the cause here. Please help if you have ANY idea of where we should be looking next

-Dee

 

Yeah that's basically what we did - jus started checking fuses and connections and as it turned out one of the plugs from the new blower motor to power source hadn't been securely connected (it was plugged jus didn't click into place) so until we were pretty much putting our hands on everything it looked as though it was connected properly. Once we did that it was smooooth cruisin lol no problems after that. Appreciate you guys tho man its really cool