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<blockquote data-quote="knukonceptz" data-source="post: 1298607" data-attributes="member: 548221">You will need to get the total fuse rating or max current draw from each amp. Add those numbers together. That is the systems maximum current draw and you want to fuse the main power wire near that figure. If that number is over 120A and you have a length greater then 17ft, 4 gauge will be to small for that application. Either way you will want a distrbution block. A fused distribution block is normally recommended for the positive side, but not required.From a distribution block, 8 gauge will handle 80A at 3-4 feet so it can be used. Nothing wrong going larger though. When looking at distribution blocks you wont find many that are 4 gauge in with multiple 4 gauge out. Reason being, how can one 4 gauge supply enough current for two 4 gauge cables if they are at max capacity? (two 4 gauge can handle over 240A total, the single input max is 120A) In most cases you can still use the dual 4 gauge out (again if the output is under 120A), just wanted point out why they are not commonGround distribution - Makes the install look good, but with two amps is not required if you are going to ground them in the same location and they are close together.&nbsp; If they are on opposite side of the car, it may be better to have a central ground. I usually ground my HU with the amps (I avoid the factory harness) so a ground block is good for multiple grounds.</blockquote>

[QUOTE="knukonceptz, post: 1298607, member: 548221"] You will need to get the total fuse rating or max current draw from each amp. Add those numbers together. That is the systems maximum current draw and you want to fuse the main power wire near that figure. If that number is over 120A and you have a length greater then 17ft, 4 gauge will be to small for that application. Either way you will want a distrbution block. A fused distribution block is normally recommended for the positive side, but not required. From a distribution block, 8 gauge will handle 80A at 3-4 feet so it can be used. Nothing wrong going larger though. When looking at distribution blocks you wont find many that are 4 gauge in with multiple 4 gauge out. Reason being, how can one 4 gauge supply enough current for two 4 gauge cables if they are at max capacity? (two 4 gauge can handle over 240A total, the single input max is 120A) In most cases you can still use the dual 4 gauge out (again if the output is under 120A), just wanted point out why they are not common Ground distribution - Makes the install look good, but with two amps is not required if you are going to ground them in the same location and they are close together. If they are on opposite side of the car, it may be better to have a central ground. I usually ground my HU with the amps (I avoid the factory harness) so a ground block is good for multiple grounds. [/QUOTE]

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