How to Connect an RC Motor Cooling Fan to the Battery

Written by kurt schanaman
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How to Connect an RC Motor Cooling Fan to the Battery
Wiring connections for an RC motor cooling fan is easiest by splicing with the wires coming from the battery holder. (rc - modell image by andreas from

Radio-controlled (RC) cars of the high-end spectrum are used for serious model car racing competitions and tournaments. Because these cars use large battery packs and high-performance RC motors, overheating means loss of speed and performance while in operation. Many RC supply outlets supply cooling fans for these motors but generally leave the wire connection problem to the hobbyist. The simplest and most successful way for most who aren't well-versed in electronics is to make a simple wire splice to the wires coming from the battery holder inside the RC car.

Skill level:
Moderately Easy

Things you need

  • Screwdrivers (either Philips, standard or both if necessary)
  • Combination wire strippers with cutter (able to strip insulation off of wires as small as 1/8 inch in diameter)
  • Crimp-on wire connectors (sized for the gauge of wire coming from the fan and the battery holder)
  • Pliers

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  1. 1

    Remove the screws holding the top shell of the RC car to the bottom chassis. Set the shell and screws off to the side. Remove the battery.

  2. 2

    Locate the wires leading from the battery holder inside of the RC vehicle. Measure about three to four inches of wire from where they are connected to that holder and cut both red and black wires in two. Use wire strippers to remove one inch of insulation from all four separated wire ends as well as from the ends of the wires leading to the cooling fan.

  3. 3

    Slide a crimp-on wire barrel connector to the red wire connected to the battery holder. Use a pair of pliers to squeeze the connector so it is securely connected to the bare wire end. Do the same with the black wire connected to the battery holder.

  4. 4

    Twist the bare metal ends of the other two red wires together. Insert the twisted pair into the other end of the red wire crimp-on barrel connector and crimp with pliers. Twist the bare metal ends of the other two black wires and connect to the black wire crimp connector in the same fashion as the red wires were connected.

  5. 5

    Install the battery into the holder. Turn on the power switch of the RC car and observe whether the fan is operating as needed. If the fan is operating, turn the power switch off and reinstall the car shell to the chassis. If the fan doesn't turn, be sure the battery has a full charge. If it does, then the splices may need to be inspected and possibly redone if any of the connections didn't crimp correctly.

Tips and warnings

  • Failure to remove the battery before working with the wires may short-circuit the battery while making the splices. Short-circuiting a battery can damage it, which may result in an expensive battery pack replacement.

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