im doing a simple home made project. wanting to know how i can use 2 electric motors to restore juice to the battery. i have 1 motor as my power source, with another as a generator, running on a pully system with a rubber band. I know i could use a gear system, but im lacking funds for gears that i can get at a hobby shop. How would i be able to use the 2nd motor as a generator to power the battery instead of the battery powering both electric motors? Im familiar with automechanics on a basic scale, but not towards it's electronic components, like the battery to the starter to the alternator back to the battery. Some how doing it on a small scale using 2 electric motors theres only a positive and a negetive wires from the motors. I dont know how or where to put my generator wires or meaning i dont know where they should go whether if i should have the negetive as a ground and have the positive wire to the battery as a positive return. If thats right then im going to need a little more motors or bigger pullies for the power motor and a small pully for the generator. Using the pully system like a bicycle theory, bigger sproket for the power source and a smaller sproket to transfer the power into the back wheel for motion. right now im using a 20 to 5 ratio on my pullies.