In the Air Force when a harnes is damaged the usual practice is or atleast was to replace the entire harness by making up a new one and properly labeling all the wires in the harness. Unfortunatly on air craft you will quite often find butt splices being used for quick repairs as well as many other things that should not be done. I go through many rolls of electrical tape on each harness making sure the harness is well sealed and protected. Also use proper 63/37 flux core solder that has non acidic flux, take your time running the wires and tape the harness up very well before applying the loom. For soldering I twist the wires tightly, solder being carefull not to use too much solder then use heat shrink to seal up the connection and for doing large bundles it is a good idea to stagger the connections. For lengthening wires I have left over wires from harnesses and a few cut up 3100 harnesses I use so I can keep the coulour and wire gauge the same when working on harnesses.
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