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Originally Posted by Brandon314159
Heat skrink is the PROPER thing to use...notice that there is very little to NO electrical tape on a stock MB wiring harness...
I've been wiring up a bunch of marine stuff and heat shrink really does the trick. 
Just use a heat gun to warm it up (lighter/match works good too) |
....and, if you really need it to be waterproof, cover the solder joint with RTV right before you slide the shrink tube in place. Then heat the tubing from the center out. The RTV fills the gaps, pushing the air out. Wipe off excess RTV extruded out each end of heat shrink.