'72 Valiant has no power
Does anything "at all" work? "No headlights" or anything else would most likely be "in descending order"
Bad battery cable connection. See if you have power at the big starter relay stud
Bad fuse link. From the stud, follow it to the bulkhead connector and probe the terminal in the connector
Bad connection right in the bulkhead connector. Pull it apart and inspect
Bad connection(s) at the ammeter. Have to get up under the dash. Remove battery ground, reach up in there and "clip" an alligator clip onto the red ammeter terminal, hook the battery back up and see if you have power there. Wiggle the ammeter connections.
Last, most rare, but "can" happen is the factory welded splice in the black ammeter wire. This is a few inches from the ammeter in the black lead up behind the cluster
READ please, this Mad article which also has a simplified diagram of primary power
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
I the image above, which is simplified, follow along. Follow the red cable from the battery to the starter relay stud. From there the fuse link goes into the bulkhead (RED)
The fuse link and bulkhead connector are your first two suspects
From there the red goes up to the ammeter, your next suspects
"Out" the ammeter on the black, one black goes back out the bulkhead and back to the alternator. "Before that" note the "WELDED SPLICE" This branches off and feeds the ignition switch, fuse panel, and headlight switch
Go to MyMopar, and download a free service manual for your car, or as close as you can get
http://www.mymopar.com/index.php?pid=31
Electrical is section 8
http://www.mymopar.com/index.php?pid=109
Also at MyMopar are third party wiring diagrams. These are sometimes simplified, and sometimes leave certain connectors and options out
http://www.mymopar.com/index.php?pid=24
Does anything "at all" work? "No headlights" or anything else would most likely be "in descending order"
Bad battery cable connection. See if you have power at the big starter relay stud
Bad fuse link. From the stud, follow it to the bulkhead connector and probe the terminal in the connector
Bad connection right in the bulkhead connector. Pull it apart and inspect
Bad connection(s) at the ammeter. Have to get up under the dash. Remove battery ground, reach up in there and "clip" an alligator clip onto the red ammeter terminal, hook the battery back up and see if you have power there. Wiggle the ammeter connections.
Last, most rare, but "can" happen is the factory welded splice in the black ammeter wire. This is a few inches from the ammeter in the black lead up behind the cluster
READ please, this Mad article which also has a simplified diagram of primary power
http://www.madelectrical.com/electricaltech/amp-gauges.shtml
I the image above, which is simplified, follow along. Follow the red cable from the battery to the starter relay stud. From there the fuse link goes into the bulkhead (RED)
The fuse link and bulkhead connector are your first two suspects
From there the red goes up to the ammeter, your next suspects
"Out" the ammeter on the black, one black goes back out the bulkhead and back to the alternator. "Before that" note the "WELDED SPLICE" This branches off and feeds the ignition switch, fuse panel, and headlight switch
Go to MyMopar, and download a free service manual for your car, or as close as you can get
http://www.mymopar.com/index.php?pid=31
Electrical is section 8
http://www.mymopar.com/index.php?pid=109
Also at MyMopar are third party wiring diagrams. These are sometimes simplified, and sometimes leave certain connectors and options out
http://www.mymopar.com/index.php?pid=24