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2018 Sierra Denali Accessory Power

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I am needing to get 2 power wires and an ignition wire behind the rear seat. I am going to pull power straight from the battery with an in-line fuse for the two constant powers. They do not draw power all the time. I need somewhere to get switched ignition power. I read a couple things where it said to use a spade connector off the ignition power post on the cigarette lighter fuse with an inline fuse. Anyone done this or have any guidance on what to use? It is only for a switched signal. There is no real power coming through it once it’s switched all the power comes from the wires coming from the battery.

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