nuckolls.bob(at)aeroelect
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 Posted: Sat Nov 13, 2010 7:50 pm Post subject: Need a tips how best to validate wiring harness work |
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At 08:39 AM 11/13/2010, you wrote:
My newbie question is around how best to validate the wiring work. I have a multimeter tester and started to do continuity checks on all the D-Sub pin assignments....then I thought I'd ask here what's best/disciplined practice to use when checking out a pre-wired harness? Is there a D-Sub pin test lead tool that make it easier / faster to check each pin assignment?
I've setup a spreadsheet to capture all the connector type, pin numbers, use / function, FROM/TO information that I will then use to feed my schematic diagrams later.
Thanks for any tips!
When you do a LOT of harness building and/or troubleshooting,
it's often useful to have a collection of test fixtures that
give you ready access to the wires in a harness to either
check for continuity (correctness) or to sample signals
that run on the wires. I own several dozen such fixtures
that were acquired over several decades of such activity.
Most look like this . . .
[img]cid:.0[/img]
Others are more specialized . . .
[img]cid:.1[/img]
In every case, the time and expense of fabricating the
tool was more than offset by expediting return to
service on multi-$millions$ airplanes.
Unless you can borrow the tools that mate with
the connectors specific to your project, it's a
certainty that fabricating them for a one-time
task will not offer a return on investment.
Most of my harness ring-out ventures was accomplished
with the aid of an individual who took one probe of
the "buzz box" and ran around to the various far
end connectors as I probed another connector while
calling out far ends by referring to the wiring
diagram. If your harnesses were professionally
built, they should have done this job already.
But it's a lot easier to find errors before the
harnesses are installed in the airplane than
after . . . and there's no really 'easy' way
to do it other than two-pins-and-one-wire-at-
a-time.
Bob . . .
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