Question about Jensen JPA285 Car Audio Amplifier

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Jensen JPA285 425 Watts 2-Channel Amplifier instalation

I just got this new van an it came with a
Jensen JPA285 425 Watts 2-Channel Amplifier but the wires are all messed up like all tweeker set it up with a bunch of house speaker wires i need to no what wires go where i no the power to the battery an the grounded wire but thats it i need to no how to be able to conect it to the radio now how do i so that >? should i use the house speaker wires or should i just buy all new wires ???

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  • hatchetcarer Nov 20, 2008

    ahhh **** i allready unpluged everything cuz the way it was set up there were live wires that wernt runnen to anything an it was fucken up my van an allmost set it on fire lol so i tulk out *** the wirein to try an make it beter im get bran new wires thanks for ur help tho when i get the newe wires hopefully itll be collor coded so itss b e easy

  • hatchetcarer Nov 21, 2008

    ya there brown but i mean u should see this wirering job lol it was really bad ill post a pic of how bad it is

  • ragonamuffin May 11, 2010

    What kind of radio are you wiring this to? make sure you leave all the wires connected to the amp! That is your only chance of figuring out how to rewire it if its unlabeled. I would get a multimeter and check for continuity on each end of each wire. either that, or if its close enough, try pulling on each wire. Good luck, it can be a pain I know!

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Yes, watch out for bad wiring! My father's 73 chevy caprice caught fire because of an amp that was wired in poorly. If you have a multimeter it shouldn't be too hard to find each speaker wire, as the speaker will show up with a certain impedance, Like 4 ohms of 8 ohms. Wiring it in phase is the real trick. For that you can only hope there is some sort of color code that the car came with, and there is a pretty good chance there is. I am assuming you are looking at the chopped radio wiring harness. There might be something like brown with a white stripe, and white with a brown stripe. It could also just be brown, and brown with a white stripe. You get the idea. They should all be wired in the same pattern, If they did not do this, then the some car manufactures just have better standards. I believe you can take a AAA battery and hit the two wires you know to be one speaker, and you should hear a pop from that speaker. I would be careful doing that if the speakers are really old, but it should be safe even then.  
Its amazing what a 15 dollar multimeter can do in everyday electronics. My friend and I built an electric motorcycle, and obviously its very crucial for that, but I have used it for tons of things besides that. Especially old car wiring. 

Posted on Nov 21, 2008

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