Mauledriver(at)nc.rr.com
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 Posted: Mon Sep 24, 2012 2:10 pm Post subject: Why did this AMP crimp on connection get singed and fail |
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Fascinating story with the switches. I could almost see Sherlock with
his magnifying glass examining the teeter-totter
If I understand correctly, you are saying that if there is
heating/singeing/burning going on in properly configured circuit, the
problem will be at the same location as the excess heating. Therefore, a
singed crimp suggests that the high resistance point is in the crimp.
Also, any voltage drop in a circuit will occur in the same place. In
my case, I had a splice-free line running from my fuse panel to the
strobe unit. Having detected the voltage drop, I imagined a chafed
wire but didn't expect that the hidden crimp barrel on one connector
would be the smoking culprit.
Increased resistance with a non-trivial current = voltage drop and heat
In my case, the voltage drop was enough to cause the strobe unit to
intermittently fire and there was enough heat to singe the crimp.
I knew that but now I "get it" a bit better in a real life situation.
Bill "it's elementary" Watson
On 9/23/2012 1:59 PM, Robert L. Nuckolls, III wrote:
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<nuckolls.bob(at)aeroelectric.com>
At 04:08 PM 9/22/2012, you wrote:
>
>
> Bill,
>
> Search "switches with faston tabs" in the AeroElectric archives. They
> discuss the discoloration of the faston insulation as the result of
> switch failure. Time frame of sept 08.
Yes . . . there was a 'rash' of failures manifesting
in 'smoked joints' that started with loose rivets on
the Carling switches. This prompted a lot of discussion
and failure-analysis/tear-downs back about that
time. Something to keep in mind as folks are unhappily
blessed with such events.
Look for a the loci of failure . . . sorta like a
arson investigation. See which parts got hottest.
These usually point to the area off poor connection
where the degradation of the joints began. Several
examples of over-heating in poor conduction areas
are explored here:
http://tinyurl.com/8d63v8x
http://tinyurl.com/8zzkfbb
http://tinyurl.com/8zzkfbb
Whether bolting alternator brackets to crank-cases
or keeping all the connections tight through
a switch, the path to failure is the same. Increase
in resistance increases heating and VOLTAGE DROP
across a joint These two antagonists team up
regeneratively to damage and perhaps fail the
joint.
Bob . . .
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