Amp turns on when second batt is installed

[Hammy 10+ year member]

Alright I have no clue what's going on here. Right now, I have the wire from the alt hooked to the positive of the first battery in the front, then a wire runs from that to the second battery in the back's positive terminal. From the battery in the back's pos terminal the wire goes out to the distro block and to the amp's. Now I have my battery and amp in the back grounded at the same spot. For some reason when I connect the battery in the back's ground, the amp turns on ( no car running, no head unit on ). My remote is connected to the hu's remote turn on. Only reason I can think of is the battery in the back is new and isn't fully charged, my front red optima reads 13.5 volts. and back redtop is reading 12.x right now. I gotta run the car some more to get that voltage the same, but it's weird, and wondering if the voltage is the problem.

Alt

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+ Battery - Ground # 1

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+ Battery - Ground # 2

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+ Amp - Ground #2

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[evo2k3 10+ year member]

i dont see how that would make the amp turn on....off the topic, I belive you should have an isolator inbetween the two batteies....but thats wouldn't be the problem either. It sounds like you have a problem with the remote wire, or the relay built into the amp. Have you tried pulling the remote wire and seeing if it does the same thing? if it doesn't go on then, just trace the remote wire back and see what the problem is. The reality is whatever the potential difference (voltage) of the batteries is, it should not be getting to the amps because the relay should have the "switch" in the off position. Try that.....let us know, I will keep thinking about it.