I have a 2-12 volt motor circuit with a max amperage load of 24 amps. The cars charging system can fluctuate between 12.2 and 14.7 volts. This causes the speed of the motors to fluctuate too much. The problem I am having is I would like to limit the voltage on the power supply line to these motors to a steady 11 volts. If I could even just limit it to steady 12 volts it would be ok. Thanks for your input in advance.