Measuring motor current (anyone tried this?)

[MrForbes]

The resistance of each breaker will probably be different. How about replacing one wire from per motor from each speed controlller to fuse panel with a longer one, same size/length for all four, and measure the voltage drop on the wires?

[DonRotolo]

Originally Posted by squirrel

The resistance of each breaker will probably be different. How about replacing one wire from per motor from each speed controlller to fuse panel with a longer one, same size/length for all four, and measure the voltage drop on the wires?

I was thinking of that, a 3 or 4 foot length of #18 with 1/4" male quick connects on the ends to fit into the PDB - I'd surely get the voltage drop I need there.

And, the wire can act as a fuse

I'm not sure I'll be able to see a speed difference between motors; they are installed two-to-a-gearbox, which slightly complicates it.

Oh yes, and I have only a few minutes to get it done.

[MrForbes]

YOu don't need to make the wire that small, you can use normal size wire, the important thing is to control the gage/length of all four, so you get useful results. The longer the wire, the more voltage drop. Try a relatively short length and see if you can measure it accurately