RustyRatRod said

You could have blown the fusible link anywhere in the vehicle working under the dash. Electrical damage isn't limited to where you are working. The fusible link(s) on these cars normally comes off the big terminal on the starter relay. Do you have a factory service manual for your car? If not, go over to mymopar.com and download one. They're free and they have the factory wiring diagrams. You're just gonna have to read the diagram and see where the main feed comes through the firewall connector and use a test light and or meter. The firewall connectors in these cars are always problematic. You could have bumped the back of it and made it lose connection if it had a bad connection to start with. You're just gonna have to track it down.

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67Dart273 said

Ammeter circuit. Power comes from the big stud on the start relay, which is "battery," goes through the fuse link, through the (big RED) ammeter wire through the bulkkhead connector, to the ammeter, through the ammeter, and out on the big BLACK ammeter wire a few inches to the WELDED SPLICE. That splice branches off, feeds the ignition switch, the fuse panel "hot" buss, the headlights, and depending on year, one or two other components.

Any one of the points I mentioned could have failed.

If you don't have a factory service manual, wander over to MyMopar.com and download one, free, and then go to the wiring section and download the appropriate wireing diagram. The manuals have factory manuals, but the aftermarket ones are sometimes easier to follow. I use BOTH

This page

[URL]http://www.madelectrical.com/electricaltech/amp-gauges.shtml[/URL]

has a good article on the failure points of that circuit, and a simplified diagram of the main power distribution:

View attachment 1716326767

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