![]() Some people prefer to use a distro block, but it is easier in my mind to simply run the wire directly from the POS+ post to each amp, in effect using the battery as the distro block. If you decide that it is better for your setup, you can choose to use a distribution block between the battery's POS+ post and the amps' POS+ inputs. If your amp accepts 1/0 wire, then this should be a 1/0 awg wire. If your amp has a 4 awg input, this should be a 4 awg wire. This wire should be sized based on the input of your amp(s). This POS+ wire connects your amp(s) to your rear battery. The more runs of 1/0 awg you have, the less voltage you can expect to lose due to resistance. So if you plan on pulling 600A, you would need two runs of 1/0 awg minimum. If you intend on pulling more than 300A of current across WIRE 1, you should add an additional run of 1/0 awg for each additional 300A of current you intend on pulling. Anything smaller than 1/0 awg wire is likely to be too small to transfer these high currents. This can be hundreds of amps of current that is passed. The reason why is that when batteries are connected together, they will instantly equalize in voltage. Without this wire, the rear battery would not maintain a charge. This wire allows the rear battery to receive the charge from the alternator, just like the front battery receives. This POS+ wire connects the two batteries' positive posts. Here is the explanation for each wire: WIRE 1 I have added some minor reference info to the original illustration to help with this tutorial. OK, here is the wiring diagram that I have used many times. If you want to run dissimilar batteries for any reason, you can use a battery isolator to keep them separated. If you choose to mix batteries, do so at your own risk. ![]() Connecting dissimilar batteries will shorten the lifespan of each battery at best, and completely drain them at worst. They should be matching batteries in every definition. NOTE: These directions assume that the batteries used are identical. I have tried helping folks before and figured I would simply make this post that I could send them to for reference, rather than keep replying over and over with the same info. So the number one question I read here on the forums is "how do I wire my second battery". ![]()
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