New to the site, did some lookin around but haven't found any clear answers. Anyway, I'll get right to the point. I have a 2001 Grand Prix GT, adding a single 12" Kicker CompVR w/ an MTX Thunder 421D amp.
Sub: https://www.crutchfield.com/S-ge3avUYWfe5/cgi-bin/ProdView.asp?g=520&I=2065C12VR4
Amp:
https://www.crutchfield.com/S-ge3avUYWfe5/cgi-bin/ProdView.asp?g=520&I=2065C12VR4
Planned on getting my wiring from KnuKonceptz. I plan on adding a 2ch Kicker amp for some coaxials I plan to put in my front doors (again, during the summer) so I want to run 4ga from the batt. to the trunk into a dist block with 8ga outputs. Here's what I need to know... does it matter what size fuse I have up at the battery so long as it's ABOVE the amps rating (I have the MTX amp hooked up, it has a 40A fuse rating, does it matter if my fuse at the battery is like 80, or 40?) Now, distribution block, if I get a fused block, do I put a matching fuse in the block by the output of the amp it's going to? Ex. MTX amp is 40A fuse, should the fuse in my distro block for the output going to the MTX be 40A no more no less? What size fuse at the battery, what size fuses in the D block
https://knukonceptz.com/productDetail.cfm?prodID=eKo-K4
w/ this block:
https://knukonceptz.com/productDetail.cfm?prodID=BC-3448
There's the kit I want to order, I know I'll have to get some 8ga. wire to run seperately from the block to the amp, but that's no biggie. What does though the RCA cables w/ built in turn on lead mean? I don't need to connect and run a seperate remote wire to the amp? Confusing me cause I've never heard of that.
The purpose of fusing a power wire is to protect the wire. The fuse value is determined by the gauge of the wire (see https://www.the12volt.com/info/recwirsz.asp). Although you CAN use a smaller value fuse in the wire as long as it exceeds the amplifier's fuse value. But fusing a wire at its max limit to begin with is the best way in the long run. See my answer in this thread.
Disregard the "turn on wire" connected to the RCA wire. Run a separate turn on wire and keep it in the area of the power wire. You can jump the turn on from the first amp to the second. Keep your RCAs away from those power wires.
-------------
Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.