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I own a 2011 freightliner Cascadia and well I know how to hook up and wire a amp on my car but not sure on my semi with 4 batteries, any help would be much appreciated thank you all
December 3rd, 2020
Just bigger.  Parts are caculated the same, wire size etc.  Try to think of what would happen if the power wire shorted out, so doing it as safe as possible.  Protect the power wire with split loom and be sure to fuse 6 inches from the battery.  Fuse siz is always caculated from wire size.  Route the wire carefully avoiding areas that might pinch, rub.  Use lots of wire ties.  Don't let 4 batteries scare you.  They are used to give the truck starting power.  Its hard to turn over a deisel.  Any connection to a single battery will give you 12 volts.  A semi is harder to do because of its size and your ability to get to areas you need. Good luck.