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Since you had the dash apart, my guess is either something caused a fuse to blow, the signal relay is disconnected, or you damaged the ground. All items are located under the dash (center). I attached two pictures for you to see. Picture 1 shows the relay and the ground wiring for the turn signals and location. Picture 2 shows the fuse that is designated specifically for the turn signals.
Now, one of these three things is what I suspect is causing the problem. First, check the fuse indicated. I attached pictures 3 and 4 to show layout of the fuse box and specifically the fuse location.
If you confirm the fuse is good, next check the ground for the signals. See picture 1. If the ground is good, confirm the wiring to the relay hasn't been damaged or disconnected.
Let me know what you find or if you have other questions.
Images (Click to enlarge)
Thursday, February 28th, 2019 AT 6:44 PM