Wow I found that quick.
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Got a 6 Groove Serpentine belt system?
Not a problem.
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This is how I would do it:
Install clutch. (easier said than done)
The safest way I can think to wire it up is with a normally closed push button switch. I would position the switch so that when driving I could hold the switch down one way or another when I am in a restful relaxed manor. That is when I would want to keep the P/S clutch disengauged, when more or less driving on straight aways and highways, with nothing going on in front of me.
Then when I have to start steering in trafic or if I have an "Oh #$%^" moment I would release the swicth with out having to think about it and have P/S back on tap.