Troubles with Turn Signals 67 Barracuda

Glad that helped. You got it.
The way the turn signal switch is diagramed, the right and left arrows move seperately.
So a left signal looks like this.
1697372110784.png
Power from flasher is connected to the green wires going to the front and rear lamps.
Brake light powerremains connected to the right rear lamp (dark brown wire).

Those are based on the Barracuda supplement. '67 Service supplement TSB 67-25-6
The Barracuda was a late entry car for 67, production started October 31, 1966. So it is hard to say if the literature was even ready for the press when the manual went to press.

The Supplement was issued as a Service Bulletin, it includes everything unique to the Barracuda, otherwise use the Valiant in the regular Manual
https://www.mymopar.com/downloads/servicemanuals/1967_Plymouth_Service_Manual_Supplement.zip

Alan

Gerald copied into CAD and pdferized them with layers.
Steve, I do not have the Accessory wiring details but here is what was available from the updated 67 supplemental manual that I cadded. Seems I have posted them many times before.
https://www.forabodiesonly.com/mopar/attachments/67-barracuda-factory-wd-rev-1-pdf.1715218101/

I've found a couple of differences in how the wires connect on my 67 coupe.
Function not changed but these things can make you scratch your head when working on stuff.

Two corrections to the factory diagram noted here.
I mention it only because you may have noticed two orange wires junctioned onthe turn signal connector.