I'm not advocating the voltage drop test to look for losses due to the length of the wire. I realize that they are very short an dlosses form length would be almost none. It is a useful test though to find things like bad terminal crimps, corrosion, broken wires and so on. In the industry I am in we deal with a lot of lower voltage, lower current DC circuits. Often the only way to find resistance issues is to power up the circuit put the meter leads on either side of the suspected problem area and see what the voltage reading is. I generally instruct my technicians that any reading above 50 millivolts is a potential problem. Obvisously larger, higher current circuits will have more acceptable drop.

I was just thinking about doing this on RC extensions though and I realized it would work fine on the positive and negative wires but not so well on the signal wire since it is pulsed. Probably the best thing to do then is keep it simple, put it in the airplane, operate it, pull it, twist it, shake it, etc. and see if it it fails. If it works then call it good.