FINAL UPDATE: Received new RJ12 cable in the mail today. Fully functional with a correct temp reading. Everything is good with the BMV712 now.
UPDATE 10/4/19: Received second Temp sensor, both (old and new) test identically. Added VE.Bus Smart Dongle to my Multi and noticed they use the same temp sensor on that. Test both on that and they worked like a charm. Reads 14*C on smart dongle. So temp sensors are 100%. Still waiting to recieve new data cable, will update then.
I have the BMV-712 hooked up to a 240ah 24v LiFePO4 battery.
I have the correct sensor I believe - Pictured below - ASS00010000
The red fused wire is plugged into B1 on the Shunt, the black wire into B2 and it is attached to the positive terminal on the battery. I am getting 27.3V over both sensor wires and 27.99 when I go direct off the battery bus (it was charging at the time of measurement).
The head unit is acting normally without issue except the temp will not register. I just get a "--" readout. What am I doing wrong? I specifically went with the Victron BMV so I could use the relay output to control the remote circuits on my inverter/charger and solar controller to shut down charging when it gets close to freezing.
I cannot find any breaks in the line for the temp wire or the data wire going to head unit. I've tested for continuity and everything comes out well.
What am I doing wrong? What can I test?