I Have an issue where the passenger stop light comes on then won't come on.  It works fine when the turn signal indicator is on the driver side. 

Well if the other side is working then I would suspect a ground problem on the passenger side. take the bulbs out on both sides & put the breakes on . check for 12+ & a ground on each socket. Then you'll have to check the wires going to the rear. They all go down the left side on thew drivers side. They are color coded. Checking faulty wires can be time consuming.  But you either have to start from the source or the end. I've always started from the end & move up. I had so many problems with mine & many bubas I ripped it all out & rewired the whole car & installed larger wiring & more circuits.

Alan is right on circuit. These cars aren't new anymore and bad grounds are common. I would do the same thing he suggests by starting at the problem and move forward. My tail / brake lights gave me problems after installing the 80-82 series bumper. Even though I had dressed up the bumper safety bar and all of the light connections when changing it out I had intermitten problems. I ended up changing the wires out, which cured the problem. I can only surmise the wire was corroded from the inside and messin with me. Good Luck!

It is definitely a ground issue with that side. The fact that it works with the turn sig. on the other side on tells us it is getting its ground thru that side. The bulb sockets themselves can have bad ground connections on them.
If you have someone step on the brake, wiggle the wires going into the bulb socket. If the bulb lights up, that will tell you the socket has corrosion, or a damaged connection. If the bulb doesn't light, then you need to start checking for ground issues along the harness. Most tail/brake light grounds are on the frame in the rear, or attatched to the bumper support.

You could try tapping into the ground wire coming out of the socket and run a ground to the frame to see if that fixes your issue. Then you will at least have functional brake lights until you get to the root cause.

LukesVette2006-12-28 06:32:00

thanks so much, will try all above and I agree with starting from the back and  I never thought of a corroded wire, great suggestions.

thanks for ya'lls help. got em going.  Bad ground!