Well don't move the grounds yet, it's possible you may not have to, though I suspect you will. Play something, and play it loud. See what your rear voltage drops to (but don't let it drop under 12V, turn it down if you need to). Then play the same exact thing, at the same volume, but measure and watch voltage on your front battery this time.
Well don't move the grounds yet, it's possible you may not have to, though I suspect you will. Play something, and play it loud. See what your rear voltage drops to (but don't let it drop under 12V, turn it down if you need to). Then play the same exact thing, at the same volume, but measure and watch voltage on your front battery this time.
Yeah pretty certain it's your ground. Ground amps to battery, ground battery to a different location. Look for a main part of the car, possibly the floor or a piece of the frame or anything that's a main piece. Don't ground off a smaller piece that's been either bolted or spot welded, like where you have it. And remember to grind off the paint on both sides.
Did you move the rear battery ground?
Got a pic? But yeah, could very well be your front ground. What do those connections look like to the frame? Just to be sure, you sure your positive run and it's connections are fine?
