I have a 96 cadillac seville sls and my rear turn signal blinks fast and the center turn bulb blinks oppisite the otuter ones changed all bulbs still the same thing any suggustions on how to fix.

 

Hard to understand what is going on but usually a fast blinking signal means there is a burnt out bulb, are the front bulbs ok?

 

I'm not really sure what's the problem, but if there's a burn bulb it should be replaced.

 

the two outter sockets have a black streak on one side

 

I'd clean all sockets with a small, soft wire-brush (a Dremel rotary tool may come handy), put a dab of clear dielectric (tune-up) grease inside, make sure the bulb is seated firmly in the socket, and test functionality after each socket is done. Treat all sockets.

A less likely cause is one or more faulty wiring harness, or their connectors. If the socket cleaning won't solve the problem, do the same to the connectors. This is labor-intensive but inexpensive, while new harnesses are not, unless you get them from a junk yard.

 

Hey I also had this problem but on the other side. I changed the bulb and fuses and still had the problem. I then replaced the socket and it fixed it. Make sure to solder your connections and cover the bare wires with tape or better yet a heat shrink tube. Hope this helps.