Resolved by Dunning-Kruger!
After blowing a fuse on my EZB-V4, when measuring pin voltages, I think I shorted between Vcc and Ground.
Is this the correct assignment for each pin in a channel?
Black Pin - Gnd
Red Pin - Vcc
White Pin - Signal
This is not in any of the EZB V4 write-ups I have seen anywhere.
Related Hardware EZ-B v4
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I think it's pretty clear what pin assignments are. It's kind of understood that generally in electronics red power + and black is negative - (or ground). So by default the white pin is signal... It is inferred somewhat but still pretty obvious... I know you have been around a while so you know there is an ezb spec sheet on the ez robot website. Been there since the introduction of the ezb4.. See some info here EZB4 Details... FYI you can always test the pins with a multimeter buy using a old servo wire with the non-plug end stripped and split (to prevent shorting of the pins which you had mentioned you did)...
Anyway, labeling this on a graphic of the EZ-B would be useful.