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Old 03-31-2007, 08:40 PM
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Alternator help on a sbc

Hello all, and thanks for taking the time to try to help me. I have a 350 in a 82 3/4 ton truck. I am not sure if I hooked up the aletnator right, when I wiried it. Well actualy, since it is not charging the battery at all, I know I didn't hook it up right. Can anyone give me a schematic on what the wiring for the alternator should be? That would be great thanks

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Old 04-01-2007, 04:37 PM
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Depends on which type you have.
See attachments showing the common GM types.

vicrod
Attached Files
File Type: doc GM 1 wire alt..doc (114.5 KB, 84 views)
File Type: doc GM alt 3 wire.doc (107.0 KB, 89 views)
File Type: doc GM alt external reg.doc (63.5 KB, 54 views)
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Old 04-01-2007, 05:58 PM
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Doc here,

Traditionally, GM uses the 3 wire alternator. It is wired normally, Big red 10 gauge wire to the fuse link, then to the starter solenoid battery bolt.

The second red wire to either a horn relay power wire, or may just be jumped to the big red wire..both are fine, the relay is better for remote sensing.

The brown wire goes to the "charge lamp" .

A 10 gauge ground from the ground lug or mount bolt is needed for proper bonding, It will ground at or near the starter on the block, clean, burnish the area, and use star and lock washers.


  • 1) 10 ga output

  • 2) Brown "Idiot lite
  • 3) Red 12 volts horn or output wire.





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Old 04-01-2007, 06:42 PM
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Thanks

Once again you have saved my bacon. Thanks Doc, much appreciated. My truck is now charging properly, thanks.
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Old 04-01-2007, 06:50 PM
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Doc here,

Glad to hear it is fixed!

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