Which fuse is the you have to change if ur car isnt signaling when u turn?

As far as the turn signal, did you check the proper fuse for voltage. Even if the fuse is good, if no voltage, the circuit is still dead. The turn fuse goes hot with key on, turn on the key, check fuse circuit for voltage, use a test lite or something. I hope you can read diagram?

First anytime you do any electrical work on ur car disconect the battery cable until ur finished.Then you wont have to worry about causing any shorts or blowing other fuses etc.
I dont see how the alternater has anything to to with ur turn signal.It keeps the battery charged when u use lights radio etc. You did not say if its one turn signal or all turn signals that dont work. It could be a bulb.One bad bulb will cause the others not to work , normally one side of the car.Mostly left and right sides of the car is on a different circuits.
If it is all of them not working , it could be the switch in ur steering colum thats bad.Its the switch that the handle u move to turn the turn signals on and off.You would normallytake off the steering wheel to fix that switch.But its a bigger jpb , a pain.So make sure its not a bulb or a fuse first and make sure ur useing the right amp fuse.If its not that.Then id check the conection where the bulb screws into the socket.There can be corrosion there and that can cause a bad conection.Besides a bad bulb thats always been the number one reason my turn signals have not worked.You just have to keep eliminating the possibilities. Keep checking.----------------------------------------------------------------------------------------
Original Launch X431 ICARD Scan Tool

Check your fuses & then recheck your wiring. Sounds like something might have worked itself loose after changing the switch out.

Your left turn signal relay might be out, if i remember correctly, it's located in the fuse box, and is as easy as changing a fuse. If it isnt in the fuse box under your dash then check under the hood, possibly near the battery.

Try replacing your flasher. It should be located somewhere around your fuse box, under the left side of the dash. You may even have two, one for turn signals and one for emergency flashers.

I'd look into the multifunction switch. That controles both hazard and turn.

there is a sginal relay under the hood in the fuse box replace it and/or ensure it isnt loose fitted

check your fuse relay its probably just a burned out fuse i had the same problem not to long ago

ur fuse box should be a weird round fuse thats ur torn signal fuse start there good luck

first it is not call realy it is call flasher try to ask for the turn signal lights flasher
but most likelly is not going to be a flasher problem since the turn signal sw trigers the flasher.