So what do the blue wire hook up too? Right now the orange and blue wires are not connected to anything but the dome light still works. And I’ll use the grey rca hook ups but do I connect them to line in or out on the soundbar? Also one more question. I’m using a rca cable with male ends on both sides to connect the female ends of the rca wires from radio and soundbar. Is that ok?
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On the radio you only need black, red, yellow, blue, and the front rca pair.
Black goes to chassis ground.
Yellow goes to 12v + constant.
Red goes to 12v+ switched (this turns radio on/off)
Blue gets connected to blue on sound bar.
Rca gets connected to soundbar. Usually radios and amp employ female rca's. Making your patch cable male/male. This is normal.
On the sound bar.
Red, black, blue, rca in is what you need to connect.
Red goes to 12v+ constant, pair this with yellow from radio.
Black goes to chassis ground.
Blue gets connected to blue on radio.
Rca connects to radio.
If you want to use the dome light. Get a simple push button momentary switch. Think doorbell switch. Orange goes to one terminal on switch. A ground goes on other. Just tap the switch and the light should go on and off. If the dome light is currently on, and you are not going to use it, ground the wire momentarily to turn it off. Then tape wire up to keep it from being grounded accidentally.
Maybe
@trigger can verify, but I am confident that should work.