Originally Posted by GTTuner
Great for installing a remote starter. This works too!
My strong opinion is that the temporary convenience of tap splices is not worth the potential headache they can cause you in the future. As the wiring is exposed to bumps and vibrations over time (several years), they chew up the wiring and the connection can become intermittent.
My father used a bunch of those to power accessories from the dash wiring in my 4Runner. Many years later, my radar detector started losing power and rebooting (lots of annoying beeps on that old Bel) every time I hit a significant bump in the road. Shortly after that, the CB radio, trigger lead for the relay that powered my onboard air, and the cigarrette lighter socket followed suit. To fix it I had to take apart the dash and run new wires to replace the ones that were mangled by tap splices. After that experience I have always crimped and/or soldered, but a proper mating connector is even better since it allows you to avoid molesting the factory wiring altogether.