i am currently running 1 ea.pos and neg 1/0 ga wire from the front to the back, would adding just 1 more pos run help or do i need to add the neg also and keep them even? Can you have more pos than neg? Good or bad?

I'd rather have more negative than positive. And if you don't have voltage difference from the front battery or from the alt to the amp or battery in the trunk then I wouldn't waste money adding more wire.

Never have more positive than negative.

But you really didn't give us any information. Why do you think you want to do this? "would adding just 1 more pos run help..." Help what? Help you spend more money? Yes, you would. Help decrease voltage drop? Maybe, but you didn't tell us what equipment you're running or what your voltage problem is.

Why are you running ground from the amp back to the battery anyways instead of grounding somewhere near the amp?

Your electrical is only as strong as it's weakest link.

Your electrical is only as strong as it's weakest link.

Huh?

So you are on the fence with this topic?

So is it better to ground the amp in the trunk somewhere or is it just a waste of wire to run the negative all the way from the battery?

It is the same just waste of wire, mnost people recommend grounding no more than 3 ft from the amp. Anywhere there's metal and surface is clean and sanded is a grounding spot.

You already have a larger wire in your car for grounding purposes, it's called your frame. The battery is hooked up to it as well. May as well use it.

Cool, that's good to know, thanks.

It depends on your wire gauge and the construction/conductivity of your automobile.

Richard Clark claims to have tested a variety of vehicles and found the average vehicle chassis is equivalent to 17' of 4ga wire.

Andy @ JBL claims they tested a variety of vehicles and found the average vehicle chassis is equivalent to 17' of 2/0ga wire.

Who's right? I don't know, I haven't tested it myself. If you have an actual frame to ground to, you would probably be pretty safe to ground to that. But it's possible, depending on the construction of your vehicle, that the chassis would make a worse ground than running it directly back to your battery.

if u do have voltage problems...

Take a set of jumper cables and connect ground clamps only, one side to front battery, other side to rear battery ground if there is a battery back there or where the amp is grounded at.

If voltage goes up.. u need a better ground or a whole run of ground.

No change?, connect the power side and test.

Remember- jumper cables more than likely not fused so when connecting power side, do NOT ground any end of those clamps!