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Then I have my ground wire hooked up to the seat (Metal part that holds it down) and I have it hooked up to the head unit, but we had to do what he called a 3 way and he just taped them together real good. And with the speaker wires they are on L- and R-.. I figured it would have to be like L-, R+ ect ect, but he told me to have them on the two middle ones. I tried every combination possible with them and could not figure anything out. So any suggestions that could be wrong with it would be GREATLY appriceated!! Thank you! (The sub is brand new, just bought it yesterday, but the amp is used, bought it from my friend)
Using two negatives will probably give you nothing at all. You need to have the positive and negative hooked up, it's actually AC so it's signal and return. Right now since you have them on (-), you are only using the return on the amp.
Given you have a single and it's a SVC and at least 4ohm, I don't think you can do much wrong with the system. Try using a (+) and a (-), use a single channel to make sure it works then you can play with bridging it.
Looking at this pic it looks like it's not bridgeable, because there is no diagram showing which way to hook it up to bridge it. I agree try hooking it to one channel only and see what happens.
You might want a bigger power supply wire too. I'm sure the turn on lead is fine though.