Here are the diagrams, courtesy of Mark at MAD Enterprises. The first diagram is cleaner and easier to follow, but doesn't have as much detail as far as relays and such. The second diagram is harder to read but gives you a better idea on how to wire the relays and feed accessories from them. There are some differences between the two diagrams which may at first seem confusing. If you understand wiring and how relays and fusible links work, you should be able to come up with your own scheme of how to wire "your" system. Everyones system may have different needs. For instance, with an 8 gauge wire running from the cutoff switch to the front of the car, you could run into problems if you sit with your car off and have big current draw from say a large stereo system, cooling fan (especially the Mark8), electric water pump, headlights, foglights, etc. I myself use this settup, and can run the Mark8 fan and small radio and headlights fine with an 8 gauge wire.
I'm not a pro with ignition systems and what wires exactly to run off of relays to make the system work properly. Notice in diagram 1 how the wire coming from the cutoff switch feeds the distribution block up front. From the distribution block, you can run power to the switch side of a relay which powers the ignition system. In this instance, when power is cut to the car the ignition system will be disabled, but power to the alternator will not be. This is the proper way to kill power to the car. It avoids and chance of a voltage spike ruining your computer or other delicate electronics. This can happen if power is immediately cut off from an alternator.
One more thing that confuses the wiring is the newer high torque starter. It's sort of hard to explain, but I have a diagram for this also. I need to scan it still so tomorrow I will post that one also.
I am in the process of making my rear mount battery perfectly legal and safe for the vehicles electronics and alternator. It takes a lot of time and some thinking as there are a lot of wires involved. I will be running anything that draws a fair amount of current off of relays and everything is going to be hidden out of site. Here's is the beginning of the project. Well sort of, the battery is in the trunk housed in a aluminum Summit box. The starter relay and cutoff switch are mounted in the box also for a clean installation.
Diagrams were deletd out of respect for Mark at madelectrical.com
They are his work and he is not comfortable with people trying to wire their cars based on these diagrams. Too much room for error and I udnerstand he does not want to be liable for any accidents if the shuttoff switch doesn't work as planned.
Check out his website and call him. If you want, he will send you the diagrams and explain things to you. He'd rather have the chance to talk to you personally and go over your particular settup.
Red 89' 25th Anniversary LX
DSS 347, AFR 185's, Victor 5.0 Intake, N-91 (hydraulic), 80mm ProM, 75mm TB, 30lb injectors, 255 Liter Fuel Pump, 1.6 Rocker Arms, 1 3/4 LTubes, 4.10s, 15x10.0" ET Drag
ET's --> [email protected]