76 dart sport fuseible links

1. I have a first edition of the Electrical Service Manual. Wiring color codes don't match vehicle in many instances.
All I have is a pdf of most of the diagram pages from a 1976 Dodge or Plymouth Chassis Manual.
I do not know if there were TSBs, but I think I've seen a seperate electric manual but don't have a copy.
2. I have the cluster on the bench
OK. That is helpful to know
3. The ammeter checks out.
How /what did you check ?
4. Both traces feeding the ammeter were burned in-two. I repaired them. The repair checked good.
What sort of check?
5. After repairing the traces I reinstalled the cluster but could not get any movement of the ammeter needle, zero voltage measured.
Lost me here.
With a remote shunted ammeter, current needs to flow through the path parallel to the meter. Voltage on both sides of the meter will be very close to the same.

Need to make a setup where current flows. For example a headlight, three heavy wires (10 or 12 gage) one of which will serve as the shunt. I'm going to guess 12 ga for 15 inches might be ballpark for the shunt. The right thing to do would be to examine the engine harness to get a better idea of what was used.

Then place the ammeter in parallel. Wire gages can be small. I think the FSM showed 20 gage. That helps them act as a safety plus easier to handle.
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6. I have voltage from the alternator to ground. This must mean that neither the fusible link nor the shunt are open.
If you are measuring voltage from the Batt (output) stud to ground and the battery is connected, yes the stud should be at battery voltage if there are no breaks in the line. The fusible link grouping on the engine harness is pretty easy to see.

To burn both traces in-two there would have to be a current spike. The only way I can see that happening is the shunt resistance increased.
or one of them touched ground. or as you suggested if there was a break in the shunt connections.