GM training specified a solder with shrink wrap or a butt connector that self sealed with heat. I personally feel a cheap butt connector and shrink wrap could be problematic in a moisture area. I just don't think shrink wrap seals that well and the connection patch is small and could be problematic with a small amount of corrosion vs. a solder. I'd use a weather tight butt connector in any area that could see water or a solder connection. Keep in mind, this is something you won't have a problem with in a few years. It would need to get wet a few times and could take 10, 15, 20 years the way these cars get driven.
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Todd
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