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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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Is this a straight 24V system... not a 12v - 24v.Correct..
The best advice is use a 50-60 amp resettable breaker..with 6 gauge wire (minimum 8 gauge) ... make sure your connections are clean, tight, and greased to prevent corrosion. USE a BIG HEAVY "jumper" cable between the + and - terminals.

Here are several sites that explain what you need to know..
I went from a 12-24v to a straight 36v Motorguide on my 21ft triton.. WOW!!!! talk about BAD A$$!!
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24 and 36 volt Wiring Diagrams

24 volt trolling motor wiring Google Search

https://www.oreillyauto.com/shop/battery-accessories-16452/battery-accessories-16508/battery-cables---accessories-17650/2000/ford/contour?sort=price+asc

https://www.oreillyauto.com/detail/super-start-4986/chemicals---fluids-16461/battery-chemicals-17661/battery-protection/01342/4742198/2000/ford/contour

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First thing you will need to do is to buy a wire adapter for your specific make & year of car. This interfaces the stock wiring plug allowing you to connect the wires from the headunit to the wires of the plug.

Here is a color coding explanation for the wires on your Alpine Deck:

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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Yes I can help, the blue/white wire isn't meant for that purpose. That wire is meant for an amplifier turn-on. the wire you want to use is the red that is the accessory lead. What I would recommend is finding a constant 12V to hook to the Yellow and hook the switch 12V to the red. This way your radio will retain memory. Or you can connect both the red and yellow to that switch and never turn the switch off. Simply use the on/off button on the radio. Good Luck I hope I could help.
-Andrew Hawkins

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