I bought the switch for the left handle on a 773 G $115 Us and mounted it on the handle of my LS 160. (same diameter pipe) Nice convient location, good quality switches. Not cheap but looks factory. It gives you 2 momentary 3 way switches for your thumb and one each, non momenary 2 and 3way switches.
I wired the 2 momentary 3 ways switches (defector up, defector down and the other chute left and chute right) through spdt relays so the switch only had to handle the current to activate the relay. @ .05 of a amp instead of 8 or 10 amps. Relays are cheap and easy to change. Also the relays should be placed so your high ampeage current has the least distance to travel. Engine compartment would be good. This way the power comes from the battery and goes out a wires going down the loader boom.
Ones like these, the sockets lock together side by side so it keeps your wiring neat and is easy to mount.
http://cgi.ebay.com/ebaymotors/5-PACK-12V-DC-30A-40A-Relay-Socket-SPDT-Bosch-Style_W0QQcmdZViewItemQQhashZitem5d2790c9fbQQitemZ400095758843QQptZCarQ5fAudioQ5fVideo
Each have 5 wires, you use 4 of them.
One goes to ground #85,
The next get a hot from your switch to energize the relay, # 86.
When energized the relay closes the switch between #30 (hot from battey) and #87 which goes to your snow blower coils. 87a is the one not used.
Diagram here
Ken