There should be no difference between the ground in the RJ-11 and vehicle ground. If you blew your fuse, then at least one of your wires is connected to the wrong RJ11 pin.Originally Posted by carter840
As for the resistor: It will "work" without it, meaning that it will mute your unit. But there's a resistor in the original mute circuit in the remote display, and it's there for a reason... so leave it out at your own risk.
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