along with running the ground to the battery, if i'm reading your first post right it seems you need to readjust your crossover frequency and gain/sensitivity.
We simply set them to a generic setting in order to test the setup. Next step was tuning the amp. Never got to that step. We are still in the test phase.
Are you certain all your positives from the amp are run to the positives on the speakers and same with negatives?
I used a double A battery to determine the positive terminal on the speaker.
The larger terminal is the positive and the smaller terminal is the negative. Each speaker was double and triple checked. The wires are color coded to be sure they are hooked up correctly.
It could be a bad amp but it would be the first one I have heard of and that amp gets used a lot around here. There needs to be a first for everything though.
I used a double A battery to determine the positive terminal on the speaker.
The larger terminal is the positive and the smaller terminal is the negative. Each speaker was double and triple checked. The wires are color coded to be sure they are hooked up correctly.
Maybe try flipping them just for troubleshooting purposes.
Also so are you trying this with bike running? On a tender? Or just off the battery?