Originally Posted by Fabrik8

Not to say you're wrong, but...you're wrong. It doesn't matter where (before or after) a load the switch or relay is, you're getting the same current through it. It's physics, and you can't dispute those laws. Current is the same everywhere around a closed loop, which in this case is from the positive battery terminal to the negative battery terminal (with the fan in the middle). The energy used to power the fan is the electrical potential energy (which equates to a voltage) that moves a current through the fan. Current is just a charge with some energy behind it, and you can't create or destroy charge, but you can use the energy that moves the charge around. That is what powers the fan. If you want to prove me right, run the wires through a multimeter before the fan and after the fan. The current will be exactly the same (or else your multimeter has some accuracy problems)..