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Which is the positive and which the negative prong on a new Black and Decker 18v charger which has 4 prongs?

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  • Contributor
  • 44 Answers

You need to use a volt meter

Posted on Sep 15, 2017

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Posted on Jan 02, 2017

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jsrock516
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SOURCE: REPLACING DRYER 4 PRONG PLUG

This is common issue. Due to some building codes the 3-prong configuration is no longer used in homes. The wiring is similiar with one exception. The 4-wire plug uses an additonal (WHITE) NEUTRAL wire.

Here's a brief explanation of how the plugs are configured:

Dryer 3 prong wire configuration:

RED - 120 VAC
GREEN - GROUND
BLACK - 120 VAC

Dryer 4 prong wire configuration:

RED - 120 VAC
GREEN - GROUND
BLACK - 120 VAC
WHITE - NEUTRAL

BOTH plugs provide the SAME source voltages to your appliance:

220 VAC - provided across the RED and BLACK leads are what drives your heating circuitry.
120 VAC - usually tapped of the BLACK wire is used to run the drive motor and timer on MOST dryers.

The wire terminal block in the back of the dryer should have a black, white, and red wire running to it from the dryer wiring harness. With the 4 prong plug, simply attach the BLACK, WHITE and RED wires at the terminal block ensuring that you match the RED and BLACK wires as they are configured and attach the WHITE wire at the remaining terminal lug. Make sure you screw them all down securely. Attach the remaining GREEN wire to chassis (dryer frame) ground. I hope ths helps you.

Posted on Feb 14, 2008

  • 71 Answers

SOURCE: how to change a 3 prong to a four prong on a mde4000 Maytag Neptu

the red wire to red black wire to black white wire to white and disconect the ground wire to the white lug and conect the green wire to the screw that is on the other end of the ground strap you disconected from the white lug

Posted on Dec 24, 2008

  • 1 Answer

SOURCE: I have a black and decker electric weed wacker,

replace the entire plug end

Posted on Sep 03, 2009

canbruce75
  • 1776 Answers

SOURCE: I have a new 4 prong plug to replace a old 3 prong on dryer

On a three wire configuration, the ground and the negative are tied together at the center position, using the dryer ground strap. Following is a description of the difference between three and four wire. Hope it helps you.
These two pictures illustrate the power wiring on a the terminal of an electric dryer. The one on top/left is the old-style three-wire configuration. Most people have this type in their homes. New code changes, though, require that dryers now have a four-wire cord, shown on the bottom/right.
Besides the number of wires in each cord, there are two important things to notice. First, in the four-wire configuration, notice that the dryer's grounding strap is folded back on itself. The whole point of the four-wire cord is to separate the ground from the neutral. The green wire (the "new" extra wire in the four-wire cord) is attached to the dryer cabinet. In the three-wire configuration, the grounding strap is left intact and the neutral and ground are tied together.


Sure hope this helps you find a resolution to your delimma! Best wishes.


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Posted on Sep 15, 2009

  • 5 Answers

SOURCE: How can I bypass the parking brake wire?

The parking brake wire has to connect to ground when the switch is in one position and connect to nothing when the switch is in the other position. I think if you disconnect the positive wire from your switch that might do it. If not, leave the positive wire off and try the remaining two wires, ground wire and parking brake wire, on different prongs of the switch. 

Posted on Apr 18, 2010

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