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AssuredElectrical, Master Electrician
Category: Electrical
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Experience:  Contractor-42+ Years in the ElectricalTrade
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Just bought a Rockwell buffer at the swap meet / flea market.

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Just bought a Rockwell buffer at the swap meet / flea market. 2 wires, one black and the other black slashes white are connected to a capacitor. That leaves white, black, red, yellow and brown. The plate states red and brown for 110 and yellow and black for 220. How should it be connected to a cord for 110v use/
Welcome. My name is XXXXX XXXXX would be glad to assist.

Can you post a picture of the plate that has this information for a visual verification of anything else that may be needed?

If you get a picture on your PC, then click the paper clip icon on the tool bar and you can post it here in the chat box.
Customer: replied 4 years ago.

??? kep getting message "access denied"to your server ??

Maybe the site is having picture issues.
Can you try uploading to. And then post the link they give you here?
Sometimes if the picture is too large a file it gives an error.

Not sure which it is right now
Customer: replied 4 years ago.

I uploaded tiny pics, uploaded the pictures and when I try to copy and paste nothing !! so here they are by copying and for how it looks now


hope this works, taking way longer than anticipated.


Pictures are fine, you got it right.

Looking at the nameplate it shows:

120 volts
Connect one line to the Red and Brown together

Connect the other line to the Black and Yellow together

Your hot side would go through the switch if it is only a single contact and the neutral side would connect straight through.

If the switch has 2 sets of contacts, then you would switch both sides.

It will not matter on 120 volts which side, black or white from power connects to the wires on the motor.
Customer: replied 4 years ago.

Thanks, XXXXX XXXXX just put wire nuts on the 2 wires I don't use or are they not hot ?

Does the black slashed black make sense to the cap ? It was that way when l bought it.


What 2 wires?

Is the cap not wired already?

The wiring diagram does not have any other wires shown or on the schematic.
Customer: replied 4 years ago.

When I bought it there were loose wires and a capacitor that had wires coming from the motor housing and terminating with solderless fastons under the taped on capacitor cover, one is black with white slashes and the other is black, spliced with a white piece of heavier gauge wire.


Ok, so what wires are loose?

I see a yellow, brown and red in the picture but we have those in the wiring.

Where do they go? Inside the motor housing?
Customer: replied 4 years ago.

When I got it, the bottom plate that covers the wiring was missing, along with the cord. Coming out from the motor housing ( this is a buffer so the motor is attached to a cast iron base) , a black and a black slashed white that went into the capacitor case ( capacitor is permanently part of a plastic case) then a white, Black, red, yellow and brown. The diagram on the motor covers the voltage selection wire.

Does the black and black slashed to the capacitor follow normal wiring practices ?

Can I use a meter to determine if the capacitor wiring, using those 2 wires is correct ? ( ie could someone have switched the 2 blacks )



If the capacitor was wired with those 2, then they should stay on the capacitor.

On a capacitor using 2 wires, it makes no difference which wire connects to which post on the capacitor.

It is a booster and used for either starting the motor or for running the motor, either will not matter.

Wiring is done internally, so if those are the 2 wires that are loose, should not be an issue.

Normally the wiring on the label will show caps in the line and where they connect also, but I do not see it as a problem if those are the only 2 wires left.

As for if the capacitor is good, you need a multi meter with a cap setting to measure it and see if it is good.
Or any heating/air conditioning contractor has the meter if you know one?

AssuredElectrical and 2 other Electrical Specialists are ready to help you
Customer: replied 4 years ago.

Plugged it in and tripped a breaker, so either the motor had a previous fault and that is why is was at the swap meet or the switch is defective.

thanks for all your assistance


How is the switch wired into the circuit?

Lets be sure there isnt anything there that would cause the tripping.
Customer: replied 4 years ago.

The switch is a DPDT, so i wired the two wire groups from the motor to the terminals on one side and the hot wire from the line to the center terminals.


I also checked that the cord set I used was wired correctly.


There is a possibility the motor was bad when I bought it and the reason the cord and bottom plate had been removed is someone took them when removed from service and the guy I bought it from was selling something he removed from the scrap pile




Ok thanks.
With a DPDT switch, i would suspect that power connects to the center screws on the left and right.
Then the motor would connect to the left and right on the top or bottom screws.
That is fairly common on a DPDT, as they are made for one item wired to the top 2 screws and one wired to the bottom 2 screws.
Customer: replied 4 years ago.

That is how I did it. I had the one power line ( black) from the cord attached to both center terminals. I wired each of the assembled pairs( red yellow) and (brown black) from the motor to an outer terminals on one side and then connected the cord white to the motor white and attached the cord green to the frame. The capacitor was left wired as received.

Plugging it in trips the breaker.

I am missing something here.
That is nothing like I posted to wire it on 120 volts.

Why the changes?
Customer: replied 4 years ago.

Think it was in the way I tried to explain.

I talked to a maintenance guy and he said to attach the yellow and red to the power white, and tape off the motor white. Then connect the brown black combo to the cord black thru the switch. Motor works !!! When I asked him why the motor white was taped off and not used, he said that's how it works.

Thanks again for your help !


Ok, that sounds correct now.
Must have misunderstood what you said, sorry
Sometimes translation gets lost in typing.
Glad it runs! Enjoy

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