bench grinder wiring

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Forum topic by astevens posted 05-22-2020 08:10 PM 275 views 0 times favorited 5 replies Add to Favorites Watch
View astevens's profile


4 posts in 627 days

05-22-2020 08:10 PM

I got an old craftsman bench grinder on craigslist. Long story short, the wiring needs to be re connected. Starting from the wall power… there is a hot, neutral and ground coming into the base of the machine obviously, there is also a capacitor with a black and red wire coming out of it not connected to anything at the moment. the switch has room for 4 female connectors to fit onto it. The neutral power coming from the wall was already connected to the top “off” side prong. The hot coming from the wall was already connected to the bottom “off” side prong. The top “on” side of the switch has a short black wire connected to it. The bottom “on” side of the switch has a short black wire connected to it too. the motor has 2 blue and 2 black wires coming out of it. So far my attempts to solve this puzzle have ended in a popped breaker or weird noises. Not much info/diagrams online. Anything helps. thanks

5 replies so far

View SpatialKing's profile


3 posts in 44 days

#1 posted 05-29-2020 01:43 AM

I think you need to post a photo of the wiring, trying to follow your description is not easy. It appears that the switch kills both the neutral and line wires, that is the white and black wires from the wall, respectively. There is nothing wrong with that, given the number of outlets that are wired backwards. The green wire should connect directly to the metal frame.
Just guessing from your description, it appears that the blue wires would connect to the cap and the black wires to the switch, so when the switch is on, they receive power from the cord. That’s just a guess though, it is hard to say without a photo. BTW, have you done a search for a service schematic or manual for that model? Historically, Craftsman is pretty good about documentation.
Follow up with a photo and I will give it another shot.

-- Woodpeckings

View Lazyman's profile


5446 posts in 2165 days

#2 posted 05-29-2020 01:51 AM

If you have the model number, you may be able to find a manual online and see if it shows the wiring schematic.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

View LittleBlackDuck's profile


4727 posts in 1598 days

#3 posted 05-29-2020 04:58 AM

If you bought it off craiglist and the wiring was stuffed, you might be lucky if it actually works… I appreciate people trying to save a few shekels, however, with the price of lower end grinders, why are you wasting your time?

-- If your first cut is too short... Take the second cut from the longer end... LBD

View SpatialKing's profile


3 posts in 44 days

#4 posted 05-29-2020 05:15 AM

Sometimes it’s just cool to get something older working again.

-- Woodpeckings

View Woodknack's profile


13397 posts in 3157 days

#5 posted 05-29-2020 07:59 AM

Click then go to images, lots of info, some of it might be useful.

-- Rick M,

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