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I need to connect an Alpine Stereo to a 12v battery in a boat. I know that that is not recommended but we got it used. I am not sure which wires to connect to where. Could you please help me?

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Connect the yellow wire directly to the battery (this is constant 12v power, to maintain memory settings). Red wire gets wired to the switched 12v system (so that the stereo turns on and off with the ignition). Blue wire (or blue/white) would be for an antenna or an amplifier (if not used, just seal it off with electrical tape). Orange wire isn't used (that's a dimmer wire for tapping into a car's dash light dimming). Black is ground. The rest of the colored pairs (gray, gray/black, green, green/black, white, white/black, purple, purple/black) are the speaker outputs. The wires with the black stripes are the negative wires in each pair. They usually say on them which color corresponds to which speaker location (front left, rear right, etc). If not, take a look on the Alpine unit - sometimes there's a decal or diagram on there, or a list, which will tell you which wires to connect to which speakers.

Posted on Sep 27, 2008

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Is the converter powered or passive? Each RCA (red or white) connection represents a + and - speaker wire for one speaker or channel. So assuming you already have the amplifier you'll cut the speaker wire coming from the head unit. From the head unit speaker wires will attach to the input or hi-level connection on the converter. The other half of the wiring goes to the speakers in the doors. Those will go to the amplifier which is or should be fed by the RCA's on the hi-level converter box.
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P o w e r Memory (+12v Constant) Yellow Ignition (+12v Switched) Red Ground (-) Black Dimmer Pink/White (Alpine only) Power Antenna Blue Amplifier Turn-on Blue/White Phone Mute Light Blue (Sony only) S p e a k e r s Right Front (+) Gray Right Front (-) Gray/Black Left Front (+) White Left Front (-) White/Black Right Rear (+) Violet Right Rear (-) Violet/Black Left Rear (+) Green Left Rear (-) Green/Black

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That's because the memory wire has not been connected to a permanent live supply.

There will be an ignition switched 12v supply and a memory wire. The first is yellow on many brands and the second is red, but you need to refer to your fitting manual to check or look directly at the wiring harness as the wires are often individually labelled.

Since they both take 12v some folks mistakenly think that they can just be piggy-backed to each other and feed from the same supply. They can, but only if it's to a permanent live feed but that then leaves the risk of the unit being left switched on when the car is parked and draining the battery.

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No power to the amp


hi there
its up to you the remote wire is just another power wire.....the remote wire can be by passed but every time you turn off your car you will need to unhook the 12v amp power wire from your cars battery (if you decide to do it this way)..........or you can hook up the blue wire from the back of your CD/DVD unit what ever you are using and every time your stereo turns off your amp will too..........
hope this has helped

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-Andrew Hawkins

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