Turn signals flash at the same time, checked all bulbs and turn signal switch, and still all turn signals flash left or right.

SOURCE: 1995 Nissan Pickup, Blown turn signal fuse

you might need a Turn Signal Column Switch, I have a 1993 Nissan Pickup and my fuse blew all the time. I dexed that problem i have some wires in the back of the truck that was rubbing on the frame. Now my running lights are not working and when i turn on my head light one will come on so i will have to turn on and off about 10 times then both of them will come on, so my turn signal switch is bad.

SOURCE: Turn signal blinks too fast

Try changing the flasher, it's in the fuse box, round in shape, and either blue or silver in color.The 4 way flasher is the same shape, to be sure you get the right one, put the left signal on and put your finger on it, if you feel it clicking, you have the right one.

SOURCE: Turn Signals

yea ok i looked it up i meant to replacethe thermal flasher. unless this is what you said you did already. it in the inside fuse box. here is a link to what it look like . thermal flasher.
http://auto.howstuffworks.com/turn-signal2.htm

anyways id check all the connection next to see if they are loose.
keep me posted

SOURCE: 1999 Nissan Altima GXE Turn signal problem

you have a busted bulb, your hazard may be working fine but the bulb is double contact so one part is working and the other is not. just check which bulb is busted.

SOURCE: LEFT TURN SIGNAL FLASHING TOO FAST

when a turn signal indicator flashes faster than is normal it is your vehicles way of telling you there is a problem with the lighting system, do a visual check of your turn signals and you will find a burned out bulb. just replace the bad one and it will return to normal