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Here are the wire placements for the switch of a DeWalt DWD520 hammer drill:
The red wire from the motor goes to the top left terminal on the switch.
The black wire from the motor goes to the top right terminal on the switch.
The white wire from the power cord goes to the bottom left terminal on the switch.
The black wire from the power cord goes to the bottom right terminal on the switch.
It's always recommended to double-check the manual or contact DeWalt customer service for confirmation, as wire placement may vary depending on the specific model and year of manufacture.
you would need to replace the switch, the brake is internal. BEFORE removing the switch make a wiring diagram to help in reassembly and make sure the wires don't touch the motor. The switch is polarity sensitive. You can either get one from dewaltservicenet.com or ereplacementparts.com, you can also try and locate a service center or authorized repair in your area at the Dewalt site. Let me know if you need more assistance
when you changed brushes did you clean the armeture,should be bright an shiney,if yes then go to basics check imput power to on off switch,if yes check on n off switch is working right.check wireing while there(for broken wire ,loose wire)if all checks out ok i would look at armeture and windings.
some of the dewalt drill switches have a one way trap (like) for the wire. you push the wire in and the harder you pull it gets tight on its self. your wires go in the bottom of the trigger look right on top of each wire there is a small **** (no bigger then 3/16) for a flat head screw drive. In the **** you will see a small lever, it needs to be turned at the same time pull. It will help to have a friend.
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