I am interested in designing/building a simple wire harness tester. The device would be capable of testing harnesses w/ up to 20 conductors. Check for continuity between intended nets as well as mis-wires to unintended nets. I would like to use it as a building aid that would indicate to the harness fabricator they connected to the correct net, or to the incorrect net in real-time (as opposed to checking after the assembly operation).
I realize there are commercial versions of what I've described. However, they are somewhat costly (> $600 each) when considering the number of assembly stations I wish to deploy these to.
Any ideas?