One wire alternator.

I ordred a 75 amp unit. I did not see the 60 amp one listed at Summit. I contacted Powermaster Tech and they said run the wire to the hot pole on the disconnect in the trunk. They also said to run 6g if under 10ft and 4g if over 10 ft. I'm starting to agree with 67Dart273. I'm not too crazy about running another big wire the length of the car and not have some kind of safety device in the circuit. 67Dart273, you had talked about a relay setup before. I have looked and see lots of 12 volt relays in the 75 to 100 amp range. Most cost around $25 to $35. Is it possible to use a relay in the engine compartment that would enable me to not have to run anothr big wire to the rear of the car? It would be great if the alt output could be fed to the hot post on the starter relay and rely on the already large battery cable to bring the charging to the battery. If possible a schematic would help. Remember when the disconnect gets switched to the off postion the ingnition and engine must shut off.