Okay, here is my problem. I purchased a book about installing car radio systems. The book has a chart that you use to for various volts and lengths for wires (for my power supply). According to the book, with my opus 150 watt power supply, I am suppose to use 8 guage wire. So I went to Lowes and purchased 15 foot 8 guage wire. The wire is huge!( round). I questioned the guy, and he had his own formula and calculated it out the same. He said that I need 8 guage. The book was refering to 150 Watt amplifier. I am confused. The Lowes salesman said that I can use 8 guage going from my battery to my in line fuse, then I can use something smaller like 12. So I purchased 15 foot of 12 wire too. When I look at the three wires from the opus power supply, they are not that big. However, I did notice that the red wire that comes with the power supply that goes to my battery is larger than the yellow and the black wire. So, I reckon it really does make a difference. My question is: What kind of wires do I actually need to go from my battery to the in line fuse and from the inline fuse to the power supply? Also, what kind of wire should go to the ignition switch and the ground. Any ideas?
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What Gauge wires do I use?