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I bought a Tekonsha P3 brake controller with a Toyota pigtail. Why dos the pigtail have an extra ground that screws to a metal surface? On the wiring harness that comes stock with the controller it says not to wire the ground to the dash...? Im confused! I tried searching for this, but found nothing.
 

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I would guess that Tekonsha recommends wiring it directly to the chassis for the best ground, while the Toyota harness is designed for a simple install. But I've been wrong before.
 
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