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First, was this alternator ever really working and charging a battery?
I need to have a look at the charging system on his model truck. There may be a connection for 12v at the ignition switch when turned on that might be disconnected.
Sometimes this 12v supply excites the alternator. I like excited alternators.
Here you go this is for a 65 but it should be the same or close to a 66. Hope it helps get the mystery problem solved.
http://www.flickr.com/photos/vic-63-65/6810251249/http://www.flickr.com/photos/vic-63-65/6810251249/ by http://www.flickr.com/people/vic-63-65/, on Flickr
Hey guys, sorry to bother. here is a pic of what I have hooked up now. still have alt light on. From the pic above mine does not look like it is hooked up correctly. The 2 black with yellow stripe to block along with wire from alt. From wiring diagram from above pic, it shows a wire from the silenoid to the terminal post.
Sorry for being a pain, wiring- Not my gig..