Ignition Wiring Issue, please help.

by accessory breaker you mean fusible link ?
The power from the bat terminal on the altenater runs to the fusible link then into the dash to the amp gauge, out of the amp gauge and on to the ignition switch, etc.. etc..
If you suspect the amp gauge is bad you can put the red and black wires together on one post. Extra wires poked into battery terminals is one of my pet peaves. I hate to see that.