Some of the after market suppliers such as Ricks offer a small, inexpensive harness for quickly modifying the existing wiring harness for internal regulated systems. They're a few bucks... plug & play. I don't know if anyone has used one or how convenient they are, but I have one that I haven't installed yet.
Check it out.
I am going to explain this the best I can. I want to bypass the voltage regulator because I went with a new alternator with internal voltage regulator. Next I want to bypass the horn relay because it is totally rusted inside. My car won't start with all the wires disconnected. So what wires need to be connected together for the car to start?