It may take awhile for the wiring splice to get hot enough to melt the solder. The whole length of wire acts like a big heat sink that pulls the heat away from the splice. The bigger the wire, the harder it is to heat up. Eventually it will.
A lot depends on the size of your iron and its wattage output. Pencil tip irons will take a long time to heat up the larger wiring.
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Ed
1968 GTO (Thanks Mom)
2006 Silverado
2007 Cadillac SRX
2015 Chevy Express
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