Question about Black & Decker 19" Electric Lawnhog Mulching Mower with Rear Bag

2 Answers

Black and Decker MM525 hard wiring diagram

I have the same mower as the picture above. I removed the saftey handle and I am trying to by pass the switch (hard wire straight to a new cord I purchased. I am done with running up-stairs to flip the breaker. Can anyone tell me what wires to match up to my cord? Thanks in advance.
Bud Man 73

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  • 5 more comments 
  • KIA1111 Jun 07, 2008

    Did you bypass the switch? If so, how did you do it with the leads for the brake (white and red leads)? I would like to do the same.

  • BudMan73 Jun 09, 2008

    I am trying to hard wire it without the switch.

  • BudMan73 Jun 25, 2008

    I am trying to hard wire it without the switch.

  • BudMan73 Jun 28, 2008

    Still looking for help.

  • BudMan73 Jul 07, 2008


  • phatypaul Jul 13, 2008

    Im having the same problem trying tofigure out what all the wires are for!

  • BudMan73 Jul 25, 2008

    The solution posted on July 19th was a VERY BIG HELP. Thanks Man 4 the help.



2 Answers

I have the same mower and same problem. (I have already spent over $75 replacing the burned switch annually. ) The black wires carry the power. The orange wire is the common. The red and white wires are used to stop the motor quickly when the switch is released. To bypass the switch, connect the two black wires together with a wire nut. Disconnect and tape off the red and white wires. Now the mower will run whenever it is plugged in. It will take a few seconds longer for the blades to stop turning when unplugged. See this thread for a detailed discussion of the switch wiring. There is a picture of it near the bottom:

If plugging and unplugging gets too annoying, I may look for a plug-in switch I can plug between the extension cord and the mower plug. Until then, happy mowing!

Posted on Jul 19, 2008


The connection the are not right. top left side is for white wire.buttom left side is for red wire. top right side is connected to black wire from motor. buttom right side is for is going to the
extension terminal. good luck

Posted on Jun 05, 2008


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Saw your post about Black and Decker MM525 Lawn Mower

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