You need to get some very thick power cables to connect your stereo amplifiers directly to the battery of your truck if your truck has a 12 volt electrical system, if your truck is on a 24 volt system you would be best advised to see a specialist as 24 volts going into 12volt stereo is going to destroy your stereo plus if you stereo happens to be wired into one of the 2 12 volt batteries that most trucks tend to have it will cause problems because one battery will become discharged will the other may end up getting overcharged!
John H, February 2009