Question about Metra 705512 Ford Prm Snd Amp Plug Wiring Harness

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Got this amp from a friend and want to wire it up to my Sony head unit. The HU does have pre-out in RCA plugs. please help. I have tried it with: RED - stereo Amp Rem In YELLOW - 12V BLACK - -12V RCA - from stereo RCA OUT WHITE/WHITE-STRIPE - to Subwoofer . I tested the subwoofer and it works fine.

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  • Senshin Oct 11, 2010

    Sorry, it seems like I have a wiring harness problem, this is wrong. It is an amp wiring problem. I am not sure how it ended up with with a plug wiring problem.

  • Senshin Oct 11, 2010

    the amp is a Ford 1r23-18t805-aa amp, if that makes sense.

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  • 30 Answers

Senshin,
Red- 12 volts switched (ignition)
Yellow- 12 volts constant
Black- Ground
Blue/white stripe- remote amp turn on/ power antenna
If you have any orange wires there for the Illumination dimmer. (head unit dims when you turn the lights on). The white and gray are front speakers and purple and green are for the rear, solid being + and black striped being -. (gray and purple are right channels)Make sure that the RCA plugs go to the input side of the amp. I hope this helps, Ray

Posted on Mar 06, 2015

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Faulty RCA cables, Or worse possible solution is if your amp stopped playing when it was pumping at high volume, you may have blown the RCA connectors inside your head unit Or inside your amp. If possible try another known good working amp with the wires you already have, If same happens, try different RCA cables. If problem persists after trying these, Its your head unit RCA connecters or amp RCA connectors. To rule out your amp connectors, try your amp in a friends car if possible, to rule out your head unit, try another good known working amp in your car with the wiring you already have

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To check for yourself, get an Ohmmeter and see if the outers of the amplifiers RCAs are connected to the ground or each other. If so then it cannot take speaker signals directly.
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Speaker level signals from a bridge amp CAN be used on grounded RCA inputs if the signal is first passed through a simple decoupler and attenuator.
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1 Answer

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You say the protection mode only occurs when you plug the RCA's in. Does it have to be both RCAs or just one?

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It possible the RCAs have too much DC voltage on them, causing the amp to go into protection.

Is there a short in the RCA cable?

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1 Answer

Alpine


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1 Answer

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1 Answer

My brand new system isnt working right...


All righty then, This is most often gaused by bad grounds. Make certain the ground of the amp is a solid clean connection. The best place is under one of the rear seatbelt bolts, next check the condition of the ground at the battery this has to be clean with a good connection to the chasis, third make sure the Head Unit also ahs a clean positive ground. If these do not yeild results then get hold of any littel portable radio, cassette player, mp3 player as long as it has a earphone jack. Get one of those cables that have a earphone plug on one end and RCA plugs on the other. Disconnect the RCA's from the HU and hook up the player. Power up the system and play back from your portable player, mess with the gain on the amp and see if you still have the same problem when playing back from the portable device. If the problem goes away then you probably have blown grounds on the RCA's on the head unit and only a repair shop can fix that or a new HU. If you still have the problem with the portable player then adjust your lowpass filters and cut off to a higher frequency until the problem goes away. The gain on these amps should never be used to make up for low output from the Head Unit. (another cause for this condition) Get a HU that has 4 to 6 volt sub outputs and crank the gain down on the amp. That gain control is to control distortion (over driving the amp) not to make it louder. If you want louder then go for the HU with the higher sub output voltage or go with a SUB with a lower ohm rating. Your amp is stable down to 1 ohm. Oh and double check if you have your subs wired correctly improper wiring at the subs can m ake this problem worse.

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