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Make sure they test it before you take it home. It is really common to see 3 or 4 bad alternators in a row from a parts store.
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Pins inside the under dash fuse box.
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Had the EXACT same issue with a cheapo ebay oil pressure sensor...well not exact, but FUNKY stuff happened.
OK I'll start with my truck is a 99 24v auto. All stock aside from a beans sump and a fass 150. I had a edge ez but it's been removed. Also I just replaced the vp44 with a used vp44. Before I replaced it I had a hard set p1689 no communication between ecm and vp44. Once I put the replacement VP in the code immediately went away and right before I had all the injectors bled(almost had it running) it threw the p1694 in both ECM and PCM and then kicked me out of the bus connection. Still have power at the data link connector.
Now I'm unable to connect my scanner(Autel Maxidas) to either, no tach signal while cranking, no wait to start light, no lift pump signal, and pin 7 on the vp44 isn't getting power. Likely because the fuel pump relay isnt getting the correct signal. If we put power to the wire from the FP relay that goes to pin 7 on the vp44 we can hear the VP click on. I've tested all fuses and grounds with my power probe 3 and all test good. I pulled the ECM plug and tested all the pins and it's getting correct power and ground from pins 48,49,50. I did notice all pins related to Cummins bus showed no signal or anything on the power probe. Pins 40 and 41 show 0.0 with key off and a little over 2v with key on. I may be making this harder than it should be but I'd like to rule out any other possibilities before replacing the ECM... Any help is greatly appreciated.