Distribution block for switched/constant 12V

whats the best way to supply multiple components the switched and constant 12v?  For instance, if I want to hook up a set of fog lights, a stereo, an LED scanner... and I run them all to the same source, how can I guarantee they all get the power/current they need?  Thanks in advance

In the case of the fog lights, you should never run them straight off of the switched source out of the fuse block. Wire the battery directly to a relay, out of the relay to the lights, and switch the relay coil by running the switched power to an off/on switch then to the coil. I would also include a fuse in line with the battery voltage feed to the relay. You can do the same with any high current draw accessory.  This way you are drawing straight off of the battery and using the switch on the low draw side. Fog lights are notorious for melting the off/on switch if you wire them directly. Even cheap fog lights are 55 Watts each. Thats 110 watts total, divide that into 12 volts and you have 9.2 amps. The 9.2 amps is the normal running amperage, the initial startup current will spike a lot higher.HotRod

thanks hotrod, so if the fog lights come with the relay installed in their harness, is that good enough protection?  Thanks again

thanks hot shot, I'll go to Radio Shack to pick that up