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Discussion Starter #1
I got the JKU used and found these under the rear seat. I am thinking to an amp or powered sub?? The radio is a stock 430N with stock speakers. Any ideas?

 

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Looks like there was an amp.
I'd back track the main power wires, and make sure it is fused, and the fuse has been pulled, so it's not live. It probably is fused and pulled, but still a good idea to double check, there's some real hacks out there. It could have been removed in haste by previous owner or dealer.
 

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RCA cables and a jack for a remote gain/boost knob (for subwoofer level). The two larger ones are power and ground for an amplifier.

If there is no plan to install an amp, make sure the power wire is fused near the battery and remove the fuse so you don't have a source of fire.
 

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is one of those a telephone plug?
Typically used for a remote boost/gain knob for an amp or subwoofer. Nothing out of the ordinary.
 

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So does it look like it was an amp that powered a sub and not the whole system?
Looks to me like there was just an under seat subwoofer installed.
 

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Discussion Starter #9
I checked the the main power cable and it is disconnected from the battery. So i am guessing I could hook up a small mono amp and sub and it should work. Assuming that everything else is still connected at the back of the radio which looks like it is.
 

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I checked the the main power cable and it is disconnected from the battery. So i am guessing I could hook up a small mono amp and sub and it should work. Assuming that everything else is still connected at the back of the radio which looks like it is.
When trading in a vehicle and removing things like aftermarket audio, it is usually easiest to leave the wiring kit (power, ground, RCA, remote turn-on wires) in the vehicle than to try to remove them for re-use in a new vehicle.

As long as there is no power to the wires from the battery, they are safe and could likely be re-used should you want to install an amplifier. You may want to see if there is a Line Out Converter on the other end of those RCAs unless the vehicle has an aftermarket radio installed.
 
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