I appreciate all of the feedback and assistance thus far and hope I don't become a nuisance with my questions
I keep thinking I'm doing this multi-meter testing wrong. In my mind I think any non-grounded wire should be open (hope that's correct term) and not visible by the conductivity test until a switch/relay closes the loop. If any of those wires have failed by making contact with the truck then I'd expect to see conductivity similar to if a switch/relay closed the loop.
I've removed all terminals from the junction block. I then touched one probe to the smaller + battery cable and the other end to the same wire's ring terminal. I got a loud constant chirp from the multi-meter as I'd expect. It's a straight wire with no other connections. I then moved the probe from the smaller + battery cable to the negative battery cable (battery is not on the truck) while maintaining the connection of the other probe to the ring terminal. Surprisingly, to me, I got a split-second "grunt" sound from the multi-meter. Okay I yanked that wire completely out of the truck. Next I did the same test with the alternator wire by touching one probe to the end that connects to the alternator and the other probe to the wire terminal that goes to the junction box, but it's disconnected. As expected I received the loud constant chirp confirming conductivity. I then moved the probe from the alternator side and touched it to a bolt going into the firewall with the other probe still attached to the ring terminal. Surprisingly I'm still getting a constant chirp. I've not pulled back the tape/loom that houses the cabling from the alternator to the junction block. But the service manual shows it to be a direct connection with no other splices/junctions.
I probably need a lesson on 12v or meter testing
I can't understand why there would be a chirp from the terminal to the firewall if those 2 aren't physically connected anywhere. There are more wires from the junction block that are also chirping when I touch a probe to them and another to the firewall. But I'm going from left to right on the junction block trying to isolate each one and reading the wire diagram to dig deeper.
Any ideas of what I'm doing wrong or what I'm not understanding? Thanks!
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