OK now we're gonna do a splice. MaxEx wanted to jump in there and describe his method of doing splices but as I said at the beginning I will not use crimp connectors for wire splices. No offense intended Max.
This time we're gonna strip our wires back about an inch and slide a long enough piece of heat shrink tubing over one end of our wire that will be long enough to cover the connection plus a little for seal.
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Twist the wires together like you're making a western union splice,break out your soldering iron and 60/40 rosin core solder and solder it up. Make sure you push the heat shrink up over the wire a good ways or it will shrink during soldering and you will not be happy.
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The next step I found necessary around boats because even though zinc chloride flux is not highly corrosive it still was creating green connections after about a year out there in the Gulf of Mexico.
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Take your favorite aerosol solvent of choice that is not chlorinated,spray a little on the corner of a rag and wipe down your solder joint. It will clean the rosin flux off and keep it from corroding if moisture does get past the heat shrink.
Slide the heat shrink over the connection as centered up as you can and shrink it down.
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