Painless? Wiring Turn/brake/Horn

From what i remember, the power comes from the light switch to the brakelight switch, which then sends power to the turn signal switch which in turn distributes power to the lights in the back.

http://midlife66.com/wiring/66exter1.jpg

As for the horn, do you think it's a wiring issue? cause when i was rewiring my car (i used EZ wiring) i realized that you need a relay and when you push the horn button it acts as a ground.

Here is the headlight switch. Looking for the turn sig graphic.
Suki243 is correct. Power flows from the headlight switch to the brake light switch on the pedel, to the turn signal switch, then out to L & R turn sig lamps/brake lamps. Start at the switch on the brake pedel switch. If you have power there, make sure it comes out of the switch when you press the pedel. You can also pull the plug from the switch and short across the plug-brake lights should stay on (if you have power to one side of the plug). CHeck that first.
ALso, have posted this before, check the connector at the headlight switch. Sometimes, when you push that large connector onto the headlight switch, it will push one or more of the individual connectors out the back of the main connecter and make intermittant contact. Watch for that too.

Here is the turn sig sw so you can see how it actually works. Great graphic.

O.o Sorry I don't quite understand your post. You took out the key, and then all your turn signals (the ones in the front and the tail lights and ur courtesy) began flashing till you pulled your head light switch to the first position?

When you ask about dash lighting? the turn signal should only affect the turn signal indicators, are all your dash lights flashing? including the high beam light and the background lights?

What do you mean window and door lock switch? did you install power locks? are they locking and unlocking constantly

It sounds like a wiring issue. I think you may have connected it to the hazard light wire? cause that receives voltage even after the key is taken out of the ignition. The turn signals won't work with the key out.
Maybe wired to the head light switch wrong.

(p.s i've done EZ wiring's harness so i'm not totally familiar with painless)