alright here we go; I am working on an M1078 LTAS with a BAE cab and a C7 cat engine. it came to us with a no charge issue, upon inspection I found that LBCD was completely fried so I replaced it now it will charge once you put it in gear however you have no 24v gauges. Next I pull the annunciator out and install it in a known good vehicle and it functions properly. from there I pull the p184 from the abs ecu, as well as the plug from the CTIS, no change and 24v gauges still not functioning. I plugged the truck to our NEXIQ and ecu is sending information, i.e. I have oil pressure, RPM, ect. I know that I am not having a communication error with the vehicle computer system however I am getting zero codes. lastly we replaced the TCM with a known good and still have no change.
this shop that brought it to us were performing an annual service when the issue began, there was nothing indicated prior to. anybody have any ideas as to what I am not seeing?