The absolute best way to wire a one wire alternator is through a 4 post master kill switch....this reducess the number of connections (compared to using a large solenoid) and isolates all power from the vehicle. If you have a 4 post switch that has 2 large post and 2 smaller, I'll bet money that switch isn't capable of handling the amperage. If you research it...the smaller posts are only rated fro 20 amps continous. Cole Hersee 75912 is the switch needed... If you do not decide to use a 4 post...wire the alternator directly to the battery...do not terminate it to the battery side of the kill switch. The battery acts as a filter and reduces the chances of the alternator inducing noise.
Jeff Brandenburg
Dykes & Strippers