Change from 3 wire to 4 wire dryer cord on bosch Axxis

They are machine screws. Remove the terminal block and take it to the hardware store to match the size of the "lugs." Terminal Block 5304409888

When replacing a 4 prong cord with a 3 prong cord you put black and red wires to the outside posts of your terminal block. The white wire from your three prong dryer cord goes to the center of your terminal block. The yellow and green wire from the dryer go together and attach to the cabinet ground.

Unplug the dryer then remove the terminal block cover and disconnect the 3-prong cord from the dryer. Note that the cord has red , black, and white wires but sometimes the red and black wires are both replaced by same color wire, usually gray and can switch places. There's also a ground strap wire also connected to the center terminal together with the white (neutral) wire.

Get yourself a 4-prong cord and note that it has red, black, white, and green/yellow wires but sometimes, like the 3-pronged one, the red and black wires are both replaced by same color wire, usually gray and can also switch places. All you have to do now is connect the 3 wires in the same manner they are connected as 3-prong cord to the terminal block. The ground strap wire now just need to be connected to the remaining 4th wire, the green/yellow wire instead of the center terminal together with the white (neutral) wire. Reinstall the terminal block cover and it's done.

It can be observed that converting a 3-prong cord to 4-prong cord is merely splitting the neutral line and the ground thereby increasing the number of prongs from 3 to 4 whereas, on the other hand, converting a 4-prong cord to 3-prong cord is merely joining the neutral line (white) and the ground (green/yellow) thereby reducing the number of prongs from 4 to 3.. The links below might enlighten you further on this matter.

Four-prong to Three-prong Electric Dryer Conversion
Three-prong to Four-prong Electric Dryer Conversion

Hi,
Here is a tip that will help you with changing your dryer plug. Dryer Cord and Wiring Dryer 3 Wire or 4 Wire



heatman101

You have to replace the dryer's 3-prong cord to 4-prong. Get yourself a 4-prong cord then on the terminal block at the rear of the dryer, connect the wires of the 4-prong cord to where the same wire colors (red, black, and white) of the 3-prong cord connects to. The only modification needs to be done is on the green/yellow stripe wire that connects from the white wire terminal to the dryer's cabinet. Remove this wire (green/yellow stripe) from the white wire terminal then connect it to the same wire color (green/yellow stripe) of the 4-prong cord and you are done. The new wire configuration would then be red, black, and white on the terminal block and green/yellow stripe wire on the cabinet.

Changing from 3 to 4 wire hookup on a electric dryer:
Power cord help for 3 & 4 prong dryer cords
This is an example of a three wire connection dryer cord hookup. Notice that there is a ground strap connected from the common center terminal to the frame of the terminal block. Place the center wire of the cord on the center terminal [ one with the ground ******** it ] and the other two wires will be placed on the outer terminals and it doesn't matter which wire goes right or left. Get the center wire of the cord right and you are in business.
This is an example of the 4 wire dryer cord hookup. Notice that the ground strap has been removed from the terminal block frame and folded back onto the center terminal for storage. You can see the colors of the other hookups. TIP: White always to the middle.

Below are a few websites.
http://www.applianceaid.com/general.html#3to4


http://www.american-appliance.com/catalog/newsdesk_info.php?newsPath=10&newsdesk_id=5

Replace the old Three prong cord with a 4 prong.

White wire from 4 prong cord goes to the center terminal of the connector block. If there is a metallic strip on that terminal that goes to ground remove it from the terminal and bend it away from the terminal and down so it either touches the case or ends in thin air. Be sure it can't touch either of the outside terminals of the 3 terminal block.

Red and Black wires of cord go to outside terminals of the three terminal block. It makes no difference which one goes on which terminal but I usually attach them so the color of the cord wire matches the colors of the wires already on that terminal.

The last terminal is green and should be attached tightly to any screw of the case or any metal bracket attached to the case that it is long enough to reach as this is the ground. This lead protects you from electrocution if the dryer has an internal problem and should be tight to the case.

If converting from a 4-prong to a 3-prong configuration, the wires are terminated at the terminal block as follows:

RED (hot) - to RED
BLACK (hot) - to BLACK
WHITE (neutral) - to WHITE
GREEN (ground) - is terminated to neutral by using a common screw at the terminal block, or by using a ground strap from the neutral terminal to a ground on the equipment casing.

If in doubt, the following link explains the color codes:

http://www.fixya.com/support/r793520-3_prong_4_prong_power_cord_conversion

If you have any questions, please ask me. I hope this helps you.

Changing from 3 to 4 wire hookup on a electric dryer:
Power cord help for 3 & 4 prong dryer cords 
This is an example of a three wire connection dryer cord hookup. Notice that there is a ground strap connected from the common center terminal to the frame of the terminal block. Place the center wire of the cord on the center terminal [ one with the ground ******** it ] and the other two wires will be placed on the outer terminals and it doesn't matter which wire goes right or left. Get the center wire of the cord right and you are in business. 
This is an example of the 4 wire dryer cord hookup. Notice that the ground strap has been removed from the terminal block frame and folded back onto the center terminal for storage. You can see the colors of the other hookups. TIP: White always to the middle.

Your issue is as follows;
"iI HAVE A DRYER 4PRONG POWER CORD \. HOUSE OUTLET THREE PRONG NEDD TO CHANGE POWER CORD.DRYER INSTRUCTION CONNECT 4 TERMMINAL.WHAT HAPPEN WHEN CONNECT THREEN TERMINAL."

A 3 prong cord should be wired as follows:

1. 1 end of cord connects to 1 outside terminal.
2. The other end of the cord connects to the remaiing outside terminal.
3. The center wire connects to the center terminal.
4. A separate ground wire should be attached from the dryer chassis, then to a metal cold water line, or an exterior grounding rod.

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Thank you,
Dave E. (Illeagle)
"Your satisfaction is my personal reward"