Starter and Alternator wires

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Rooster73

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South Central Idaho
First Name
Andrew
Truck Year
1976
Truck Model
K10 Scottsdale
Engine Size
350
Looking for some help or at least a direction to go to find an answer. I picked up a '79 GMC k1500 Suburban. The previous owner started to pull the engine out and then gave up. The wires to the starter and to the alternator were cut. I'm not sure which wires and how many wires there should be and where they all go to and come from. I'm finding lots of wiring diagrams online, but they are confusing to me, or they conflict with each other.

Another question related... Can I solder in splices or am I going to have to pull new wires? I'm not sure if any of these wires will have fusible links and if they do, I'm not sure if they've been cut out too.

Any suggestions or direction where to find this information?

Thanks.
 

Ricko1966

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c20
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Did they cut all three wires to the alternator? Starter should have two wires with fusible links going to the main post along with the positive battery cable. A purple wire going to the s terminal on the solenoid. Alternator needs 1 wire to feed 12 volts to the battery from the B+ terminal a brown wire to terminal 1 to work dash light and as exciter wire. Third wire is voltage sensing wire. Is the harness still in the truck and are the cut pieces? I can't imagine someone would cut them and disconnect them,so I'm thinking all the wires should be there. This should be a simple splice it back together situation,or splice on extensions where the harness was cut sitiation
 
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Rooster73

Junior Member
Joined
Feb 19, 2024
Posts
10
Reaction score
12
Location
South Central Idaho
First Name
Andrew
Truck Year
1976
Truck Model
K10 Scottsdale
Engine Size
350
The cut off portions on the starter are gone. The starter was sitting inside the cab. The alternator was gone completely. I think I’ll be good to splice some sections in. I just wanted to make sure the right wires were there and I wasn’t missing any fusible links or anything. I haven’t done much rewiring so I’m not experienced with what wires exactly go where. The other square body I have the wiring is kind of cobbled so it’s not a great reference.

The harness is still in the truck. It’s almost as if they just cut the wires when removing the starter and alternator. Weird. Not how I would have thought anyone would remove the starter or alternator.
 

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