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Essential. Toyota was my PO.I’ll put a vote up for the ground as well. My turn signals used to do the same thing. By default the turn signals ground through the stalk to the body. That area corrodes up over time and the grounds go bad. When they do, the signals start working intermittently or not at all.
The best way to make sure it stops happening is to run a ground wire directly from each signal. I mounted a small screw through each housing and ran grounds back down the existing turn signal harness and into the engine bay. They’ve worked great ever since.
The black and white wire is the one I added. It follows the OEM wires down and terminates at one of the bolts on the fender inside the engine bay. Keeps it out of the rain and the elements and provides a much more positive electrical contact.
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