TaintedSnake01 said:
i do this every day at work.
make sure you tape using UL approved electrical tape and make sure not to have strands of wire poking through the tape!!
Mike
While tape may be great for some situations, do a professional job and save yourself the later headaches that even the best electrical tape can cause with exposure to the elements and age, it will eventually unravel - and its never water tight(if at all), for very long........
Get some good quality heat shrink...and for automotive applications, you can't get it at Radio Shack. Most dealerships have a kit the local nut/bolt supplier fills regularly, or go to a "REAL" electrical supply house, or industrial supply like Grainger, MSC, etc. Get the stuff with the waxy core that melts out around the heatshrink to seal it.
That's what Ford specifies for the replacement pigtails for nearly everything under the hood anymore.
Here's a great FAQ for soldering:
http://www.epemag.wimborne.co.uk/solderfaq.htm