I need electrical help.
@harrisonm has given you the best method of diagnosing the problem. Unless you see something obvious, you need a strategy that narrows down the problem. If a fuse is blown, then there is a short. If not, then you are probably looking for a break or bad connection,
The wiring diagrams @67Dart273 mentioned are invaluable in figuiring out how items are related. The factory service manual diagram is the most complete and will be the most accurate. So download the service manuals for '73 and look in the electrical sections. The aftermarket diagrams sometimes are easier to read. '73 up diagrams are more difficult to work with than the earlier ones. They are a little bit like puzzles that need to be pieced together. I often redraw the circuit so its easy to understand.
As it happens we can give you a head start.
Here's how the turn signal circuit is wired.
B1-18W translates to power for Backup lights 18 gage wire, White insulation.
D1 -18 Bk is power to turn signal flasher 18 gage wire Black.
CE(2) is Connector Engine 2, position B. (there's a diagram of the connector in the book).
A lot more here:
https://www.forabodiesonly.com/mopar/threads/burnt-some-spaghetti.540122/post-1974292763
Note the Horn Relay is on seperate fuse. But as someone noted above, the turn signal switch and more directly the column connector will have wires from both the horn circuits and the horn circuit.
if you follow the above link to the thread "Turn Signals not working, blowing fuse" you'll see how we tracked that one to a short of the back up wire on the transmission case.
@harrisonm has given you the best method of diagnosing the problem. Unless you see something obvious, you need a strategy that narrows down the problem. If a fuse is blown, then there is a short. If not, then you are probably looking for a break or bad connection,
The wiring diagrams @67Dart273 mentioned are invaluable in figuiring out how items are related. The factory service manual diagram is the most complete and will be the most accurate. So download the service manuals for '73 and look in the electrical sections. The aftermarket diagrams sometimes are easier to read. '73 up diagrams are more difficult to work with than the earlier ones. They are a little bit like puzzles that need to be pieced together. I often redraw the circuit so its easy to understand.
As it happens we can give you a head start.
Here's how the turn signal circuit is wired.
B1-18W translates to power for Backup lights 18 gage wire, White insulation.
D1 -18 Bk is power to turn signal flasher 18 gage wire Black.
CE(2) is Connector Engine 2, position B. (there's a diagram of the connector in the book).
A lot more here:
https://www.forabodiesonly.com/mopar/threads/burnt-some-spaghetti.540122/post-1974292763
Note the Horn Relay is on seperate fuse. But as someone noted above, the turn signal switch and more directly the column connector will have wires from both the horn circuits and the horn circuit.
if you follow the above link to the thread "Turn Signals not working, blowing fuse" you'll see how we tracked that one to a short of the back up wire on the transmission case.