Hello Customer (name blocked for privacy) and welcome to JustAnswer!
You will need 3 capacitors (for each motor if you have more than one):
1- One across the brushes or motor leads,
2- If the motor has a metal case then a capacitor from each lead to the case.
Capacitors should be connected as close to the motor as possible with short leads. Generally soldering is necessary. A wire should be run from the motor case to the common point, usually the negative battery terminal. Two motors can be connected to one shield or drain wire. Nothing else should be connected to this wire.
The value of the capacitor isn’t critical. Suggested values are 0.01 to 0.1 microfarad and voltage rating should be 50 volts or higher. The capacitors should be non-polarized, type, that's with no + and - ends.
If in the rare case that one motor lead is connected to the case, do not install the shield or drain wire.
You may also read this:
http://www.rktman.com/rlh/tips/tech/motors3.html
Hope this helps, have a great day!
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