Since car audio amplifiers draw a lot of amperage wiring one in improperly can result in overloaded power wires shorts and even electrical fires. Find the total rms power of each amplifier.
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Do you need a fuse for an amp power wire. Your installation package will come with a fuse holder. Of course if your system is powerful enough to demand that you install a heavy duty fuse its important that your power and ground wire be of an appropriately heavy gauge as well buck pomerantz from crutchfield. The rms power of the single channel will be the wattage you will reference. Its a good way to burn down your house. If its not a dedicated line to a range dryer or water tank its probably only 12 ga or 20 amp max wire. If you place the fuse at the amp and the cable shorts out somewhere between the battery and the fuse then the fuse wont provide any protection at all.
Your amp should come with a power cable thats approximately 15 to 19 feet long. This is a more accurate way in finding out what gauge of wire you need and can possibly save you money in the long run of your installation. If your led lights bars draw a total of 1500 watts then i suggest a 150 amp fuse. You must supply the amps power and ground wiring an inline fuse a remote turn on wire rca cables and speaker wires. 12 ga with 25 amps will get warm. Power and ground wires the power and ground wires need to be thick enough to accommodate the amps demand for electrical current or the amp wont operate properly or put out its rated power.
From the battery in the engine compartment you will be running this wire through the firewall and underneath panels described in the previous paragraph until it reaches the amp. The fuse is supposed to melt and breakers release before the wire catches the house on fire. It may already be integrated into your power cable but if it isnt then youll need to install it yourself. Connectors and wire nuts get very hot and poof. Connections will get hot. In this case you can safely go with either a 60 or 70 amp fuse.
You dont have to have a fuse on your power cord but if you dont yo could end up with frying your amp if you touch the ground and power wire together so if you can put one on i dont right now. 1500w 12v 125 amps but you should add a bit of a buffer about 20 more so a 150 amp fuse is perfect. For example if you have 500 watts rms on one channel that.
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