Have a 93' chevy 1500 4x4. no brake lights. replaced right bulb assembly.(it was melted a bit) now have no parking lights. when i hit pedal parking lights come on, no brake lights. i turn right blinker on and hit pedal and blinker goes very fast and the lights on the radio blink. also when i hit pedal the lights on radio lite up. i checked all fuses. they are good.

that sounds like a earthing fault , check the wiring from the lights for signs of breaks etc, and trace earth back to chassis connection to ensure a good earth

There is a short circuit somewhere in the system dealing with activating the brake lights. It could be any number of things:

1. The bulbs on that circuit may have corroded and the contacts have melted such that they touch creating a short.
2. Sometimes the filaments in a dual filament bulb short together.
3. It could be a wiring issue

So your first step would be to remove the brake light bulbs; inspect them for corrosion, bad filaments, dirt in the socket...etc. Depending on your vehicle's age ... if it is an older car, I would just go ahead and replace both rear bulbs ... and take a look at the middle "third" brake light also.
If the bulbs are not the issue it could be the switch that is activated when you push your foot on the brake.
Since the brake needs to be depressed on most newer cars to start the engine ... you might also be having problems starting or changing gears out of park ... since the switch is usually connected to the car's onboard computer and it is looking for a depressed brake pedal signal.

Good luck on your troubleshooting.

Helpful??

Bad circuit board tail light asseblise connector pin to board poor connection or burned push in light bulb sockets
On my '93 Chevy PU the new ones went bad within months I repaired the original ones by soldering all connector pins to the board cleaned the sockets chipping out melted plastic been working for five years now.
Care must be taken to keep solder from preventing wire connector install while using enough that plugging it in will not break these delicate unions.
Required pulling them several times to Finnish repair successfully.
Very disappointed in replacement parts.

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Parking brake release cable snaps - Chevy Avalanche Fan Club of ...

chevyavalanchefanclub.com > ... > Problems: Brakes

24 posts - ‎16 authors
Went to release the parking brake on my 04 and the cable snapped. ... More like the end cap coming of the cable that attaches to the foot pedal. ..... Then I released the parking brake, pulled out the broken release cable/handle assembly, ...

How To Install Repair Replace Parking Brake Release ...

? 5:54
https://www.youtube.com/watch?v=qx0oGfV62NQ
Jun 23, 2011 - Uploaded by 1A Auto Parts
How To Install Repair Replace Parking Brake Release CableHandle ... or replace a broken or worn out parking brake release cable handle.

Emergency Brake Pedal Assembly & Stuck Brake Cable ...

? 10:13
https://www.youtube.com/watch?v=0jYfvthBzhU
Apr 17, 2014 - Uploaded by corgLLC
Emergency (Parking) Brake Pedal Assembly & Stuck Emergency (Parking) Rear Brake Cable The emergency ...

E-Brake Cable Broken? Stuck Emergency Brake... Help Please ' Chevy ...

www.tahoeyukonforum.com > ... > Engine & Drivetrain

sounds like u have a bad brake light socket or the parking light filament in one of ur bulbs has blown and is now touching the brake light filament causing it ti cross power

Check the brake light switch on the brake pedal. Sounds like it slipped out of adjustment. When pedal is depressed, the button on switch will extend and be on to pass current to the bulbs.
Also, you need to figure out the tail lights: those two filament bulbs are for park lights and for brakes/turn signals. One filament is for the parks, the other filament is for both brake and turn signals. American cars have the brake lights wired through the turn signal switch- from the brake light switch on the brake pedal to the turn switch, and then out to the rear bulbs for brakes and, or turn signals.

Then the problem is most likely either a faulty brake light switch located on the brake pedal lever assembly under the dash or a broken wire at the brake light switch wire connector, or the turn-signal switch is faulty. If you can remove the wire connector from the brake light switch and jumper the wires and the brake lights come on then the switch is faulty, and sometimes if you step on the brake pedal and wiggle around the turn-signal switch the brake lights might flash or come on indicating a faulty turn-signal switch, however that is not always the case. Here is an image of the brake light switch to help assist you, and let me know if you require any further assistance.

Sounds like you 've got a cross connection in the rear right taillight bulb, or wiring to that area.
Start by pulling the bulbs out and checking if it makes any difference with the bulb removed. Check the brake pedal...see if the parking lights still come on.
Look at the bulb socket contacts, and the bulb contacts and look for black marks, or burned out filament in the bulb.. if everything looks good there, start tracing the wiring back and look for cuts or a place where the wiring may have been pinched, cut, bared etc. if your right turn signal isn't working and the parking lites are getting triggered, it's got to be in that right rear taillight or wiring...

Make sure you have the right bulbs in the right place...Sometimes they will fit, even though they are not right...Your brake light bulb should be a two filiment bulb...If it is one , then there goes your problem...Now if your bulbs are interchangable, go ahead an swap them around, and see what happens...Goodluck....

It is the brake light switch - mine burned out, Takes a few minutes to repair. Once you install the switch you have to set it to your pedal. I just step on the pedal and adjusted the position until the lights came on - real simple...