1/12/2024 0 Comments Battery cable splice repair kitHeat shrink tubing should cover insulation and soldered wires. Once soldered together with electrical/electronic solder and flux to keep copper from oxidizing as its soldered, let the wires cool off before slipping the heat shrink tubing over the soldered connection. Once cut, slip a piece of heat shrink tubing over one wire far back to prevent heat from soldering hastening the tubing to shrink. That looks like 10 gauge wire and if there's enough slack, cutting out the corroded part, stripping back insulation and either meshing the clean ends together or use a plain butt connector crimped onto both ends of wires, solder can repair this damage. If you attempt to cut this wire for repair, disconnect battery negative first to prevent blowing a fuse or becoming an arc welder. Insulate with many layers of high quality electric tape and you'll never have a problem with it. I've used them on heavy battery cables to connect high current loads, and they have lasted the life of the vehicle. These are especially useful for high-current applications. But if this car is a keeper and if this wire is subject to movement because of engine movement, a better choice would be to cut out the corroded section, then use a split bolt connector. If you're planning to keep the car for just a couple of years, solder should be fine in the short term. However, soldered connections in stranded wire that are subjected to vibration and physical bending can lead to fracture of the wire through metal fatigue. Any added resistance from solder is completely trivial. Yes, solder has a higher resistance than copper, but current in a properly soldered joint passes through solder for only a small fraction of a millimeter because the two wires to be joined are already physically touching. After disconnecting the negative battery terminal, if you cut out the corroded section of wire and then make a proper solder joint - which begins with a secure physical connection between the wires to be joined - the resistance of the soldered cable will for all practical purposes be indistinguishable from the original wire.
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