Thanks, but now I'm a little more confused.
1) In your answer in #1
, you say "yes" the path indicated is the charging path. But that path goes through the ampmeter, according to the diagram.
Then in #3 you say the charging current never goes directly through the ampmeter. This seems to contridict the answer given in #1, since that path has the ampmeter in it. Also, the ampmeter shows charge and discharge, so it seems the ampmeter should be in the charging path.
Perhaps I'm confused by what you mean. I DO understand that typically an ampmeter is just a volt meter and the voltage is developed across a shunt resistor (in the meter itself). If that's what you mean, I understand but that wouldn't then change the point of my questions or assumptions.
2) Your answer:
"The purple path has nothing to do with the starting of the truck except the part from the battery to the starter."
Yes, I understand that. The purple path is the source of +12V to the ignition switch (I believe). That path is connected to the Yellow wire, when the truck is started. So since the truck starts, all of that path is good, including the purple path. And since that path has the fusible links, they must also be good.
3) Your answer:
"If it were me I would suspect one of the fusible links if the alternator is good. "
I don't think it's a fusible links (unless there is one not shown), because if I open up the ampmeter circuit, the truck won't start. If I short around it, it does start. And those fusible links are in that path (purple path), which I know is good. The fact the truck will start only when that path is closed seems to imply the links are good.
4) I'm still confused
about the specific purpose of the BLK wire going from the alternator to the meter. The meter path is all hot, implying the BLK wire is hot also. The alternator shows 4 wires connected.
- LT GRN (field connection),
- RED (output, I assume),
- BLK wire on left, in diagram (chassis ground)
- BLK wires on right, in diagram (????)
But the one on the right, in the diagram is confusing me, as to it's purpose. It must be hot, since it goes to the ampmeter also. But exactly what does it do.
5) Your answer:
"I don't believe you can see this whole ammeter thing on your diagram as it is very vague in the connection department."
Now you see why I'm confused.
NOTE: To anyone else joining in at this point. I refer to paths and colors. You need to look at the images in the links I previously provided and the descriptions or you won't be able to follow anything after that point.
To avoid confusion, I'm repeating the links:
Charging path (yes, no)
Hot path with unknown purpose
6) I know I'll eventually find the problem.
It would just be quicker if I understood the exact (and complete) charging current path from alternator to battery. Along with this I also understand that the VR has to sense actual battery voltage and that is the wire from RED on VR to RED on Alternator but that is already checked good.
The VR and Alternator have already been replaced. So, I'm thinking connection in the charging path, that doesn't affect anything but charging.