when its factory fitted, there is no "piggy back" as such. the factory wiring will already have the bluetooth wiring incorporated, hence there is no need for an additional quad-lock connector.
in a retrofit situation, the quad-lock connector that normally goes to the back the rns510, is "intercepted" by a piggy back quad-lock connector. this connector then feeds the rns510 & the bluetooth wiring.
so effectively, u have 3 quad-locks when retrofitted, as opposed to just the 1 when its factory fitted.
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