Where do these wires go to?

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Does anyone know where these wires go to? Three wires are on the same loom coming out of the passenger fender, a heavier gauge white and then a white & yellow to a two prong connector. The heavier wire has 12v . Or is there an online manual/schematic where I can look this up?

Truck year = 83

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cruisermatt

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that is the alternator wiring
 
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Thanks @cruisermatt ! So truck now has a 5.3l vortec. The dual connector plug was isolated and not used, why would the bigger white wire be hot even with ignition off, another wire was spliced into it and it has a ring connector at the end. trying to figure out where it would be connected to??

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OSS

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If the vehicle is recently purchased, orphaned wires are often sloppy carnage from previous owners redoing their own wiring scheme. They don’t think to remove or label a disconnected wire, but just disconnect it because its no longer needed — and just leave it dangling.
There’s probably half a million FJ60s by now that have mangled and mcgyvered wiring
 
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If the vehicle is recently purchased, orphaned wires are often sloppy carnage from previous owners redoing their own wiring scheme. They don’t think to remove or label a disconnected wire, but just disconnect it because its no longer needed — and just leave it dangling.
There’s probably half a million FJ60s by now that have mangled and mcgyvered wiring
@OSS , Ive owned the truck for over 15 years and the Vortec conversion was done during my ownership. I had paid somebody to do the conversion but ended up having multiple issues, about three years ago I pulled out the engine and did some work on it myself, I disconnected the all the wires and probably forgot to reconnect the wire above. I only found it cause I’ve been working on a dual battery setup
 

cruisermatt

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That is the original main charge wire
 
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Your swap probably doesn’t need it be connected to anything. Mine isn't.
 

cruisermatt

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It just goes straight to the battery. It splits off into the dash as well to power some constant +12v stuffz

Definitely make sure you have whatever you have for a main charge wire on some sort of fusible link
 
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Yes, to clarify, I mean that ring terminal end only. You definitely need to keep the other end connected to the battery. At a minimum, you should tape up that ring terminal to avoid a short. I ran mine to an aux fuse box.
 
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That’s a great idea,
 

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