Worth it or not?.. (elect. harness thread/ charging issues)

[Cntymnty77]

Is this a regular 10si alternator? They won't charge without the connections on the side connector. It looks like you're wrapping terminal 1 right to the alternator output and terminal 2 to nothing. Was the regular alternator wiring harness removed? I thought terminal 2 was sense and terminal 1 was for the field. So 2 should tie to the starter motor or battery - tied right to the alternator output (as shown below) will make the voltage lower than it's supposed to be. Terminal 1 goes to the "generator" lamp in the dash, which is how the field is excited by switched ignition. If you don't have that light you can use a resistor.

To be honest, I have no idea. This is the way it was wired when I got it. I’ve seen a couple factory diagrams and one of them seems to match the way mine is wired but I don’t know if it’s the way it’s supposed to be. My truck has all gages and I believe it’s factory, I don’t know if that makes a difference or not?

 

[Blue85]

1977 wiring diagram shows the regular 2 wire plug on the side.

http://www.mediafire.com/file/51smx...hevrolet_Light_Truck_Wiring_CK_10_30_Only.pdf

There is such a thing as 1-wire alternator, because people give up on making it work right or are really in love with clean engines. The factory setup makes sure it doesn't drain the battery while the truck is off, keeps the proper voltage where it's needed and gives you the little indicator to show it isn't charging.

 

[Cntymnty77]

1977 wiring diagram shows the regular 2 wire plug on the side.

http://www.mediafire.com/file/51smx...hevrolet_Light_Truck_Wiring_CK_10_30_Only.pdf

There is such a thing as 1-wire alternator, because people give up on making it work right or are really in love with clean engines. The factory setup makes sure it doesn't drain the battery while the truck is off, keeps the proper voltage where it's needed and gives you the little indicator to show it isn't charging.

Thanks!