My controller is using two12V relays to switch the needed current to the motor(forward and backward) . I added a second motor with its own two relays, but the current was not enough to drive the additional relays.
Switching is done with a Single 12v line and two switched ground lines which are pulled low to switch the relay.
Therefor I am using transistors and the 12V from the battery to amplify the current to the additional relays
Comments are appreciated.