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<blockquote data-quote="loopkiller" data-source="post: 5395057" data-attributes="member: 601690">First things first, batteries can transfer hundreds of amps of current immediately. They will instantly equalize their voltages as soon as they are connected. So even if your amps only pull let&#039;s say 50A of current, the batteries themselves can transfer much more instantly.So proper gauge wire and fuses is essential. 1/0 gauge wire is highly reccomended. Always use fuses that are rated to match the rating of your wire. You will need 2 fuses on each POS+ battery interconnect that is longer than 18 inches. These fuses should be within 18 inches of the battery.As for the grounds, you should always run a wire if you can between the batteries. You should use the same size wire as you ran for the POS+ connection. Only difference is you do not need to fuse the NEG- interconnect. Some people choose to use a frame rail instead of a wire and that has been known to work well.The thing to be careful of is that most modern cars do not a have a single piece of steel that runs from the rear to the front. You will usually have multiple pieces of steel welded together to make your chassis. These welds add resistance to the ground, which can lead to many problems.When it comes to choosing the correct wire for your install, you have to take in to account the amperage and distance to figure out the correct wire. There are many online tables to figure out which is needed. But to know really what wire to choose, you need to check the ratings from the manufacturer of the wire. If it is worth buying, they have a chart.</blockquote>

[QUOTE="loopkiller, post: 5395057, member: 601690"] First things first, batteries can transfer hundreds of amps of current immediately. They will instantly equalize their voltages as soon as they are connected. So even if your amps only pull let's say 50A of current, the batteries themselves can transfer much more instantly. So proper gauge wire and fuses is essential. 1/0 gauge wire is highly reccomended. Always use fuses that are rated to match the rating of your wire. You will need 2 fuses on each POS+ battery interconnect that is longer than 18 inches. These fuses should be within 18 inches of the battery. As for the grounds, you should always run a wire if you can between the batteries. You should use the same size wire as you ran for the POS+ connection. Only difference is you do not need to fuse the NEG- interconnect. Some people choose to use a frame rail instead of a wire and that has been known to work well. The thing to be careful of is that most modern cars do not a have a single piece of steel that runs from the rear to the front. You will usually have multiple pieces of steel welded together to make your chassis. These welds add resistance to the ground, which can lead to many problems. When it comes to choosing the correct wire for your install, you have to take in to account the amperage and distance to figure out the correct wire. There are many online tables to figure out which is needed. But to know really what wire to choose, you need to check the ratings from the manufacturer of the wire. If it is worth buying, they have a chart. [/QUOTE]

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