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Central PA | WOAH ! Way Too many ignorant comments. You may be skilled in precision ag but are not electrical engineers. I will try to clear the mud.
Terminators are resistors used on transmission lines (the CANBUS Pair) that match impedances of the line to the load, and minimizes reflections and standing waves that can cause data transmission errors. Every transmission line (radio, phone, dsl, computer network) needs to see the proper matched load for effective transfer of signal. The termination must be a certain impedance in ohms (similar to resistance) wether from an active or passive load.
The voltage DIFFERENCE between the two wires is transfering the digital encoded signal (again balanced versus unbalanced transmission lines is beyond the scope of NAT) and the ground wire is only for noise immunity (EMI).
Those transitions are continuously happening at very high rates. Putting a DC or AC mulitmeter on either or both wires will tell you nothing.
Any damage to a transmission line that alters the physical dimensions or physical characteristics (think crushing, moisture and dirt migration) can result in losses in transmission signal and data losses. (don't pinch your radio coax cable through a window or door) CANBUS wiring is much more sensitive than the old voice only telco lines.
PLEASE STOP the speculative answers, it is not helping, just adding to the confussion.
Edited by provident 12/27/2020 19:54
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ISOBUS - CANBUS (explanation for dummy’s)
