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| Whatever that blue wire is, it's not part of the CAN spec. Perhaps they are using it as a ground (despite the shielding which is grounded). Or maybe it's some kind of 12V control wire. But I suspect it is GND. CAN signalling does require a common ground as a 0v reference if I understand it correctly, but it need not be part of the twisted pair, though. Usually I see 12V, ground, and then the twisted CAN pair in wire bundles I've looked at.
Edited by torriem 1/5/2022 21:14
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Does anybody make their own CAN cables?
