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

Four-Wire: Green

The green wire is the ground wire, and it is the difference between a three-wire and a four-wire cord. (In the three-wire system, the ground wire and the neutral wire are the same.) The green wire connects to the dryer frame. Look at the cord-connection terminals on the back of the dryer. Very close by, you should see a screw sticking out of the metal panel. It will be labeled "external ground connector" or something similar. Connect the green wire to that screw.

Four-Wire: Black

Most appliances in your house run on 120 volts of electricity, some on 240 volts. The dryer needs both--240 volts to run the drum and heating element, and 120 volts to run the timer, thermostat and other components. For this reason, the dryer cord has two live or "hot" wires--one black, one red--rather than a single hot wire. The dryer draws 120 volts from each hot wire to get the 240 volts it needs for the heavy work, then pairs one hot wire with the neutral wire for the 120 volts to run the smaller functions. Look again at the connection terminals on the back of the dryer. There should be three screws in a horizontal row. Connect the black hot wire to the terminal on the left.

Four-Wire: Red

Connect the other hot wire, the red wire, to the terminal on the right. (In truth, you could connect either hot wire to either hot terminal, but it's standard procedure to put the black on the left and the red on the right, so do so.)

Four-Wire: White

The white is the neutral wire, and it connects to the center terminal. There may be a metal strap attached to this terminal. That's a ground strap. When a three-wire cord is attached, it serves the same function as the ground screw mentioned above.

Three-Wire: Gray

If you have a three-wire cord, then all three wires will be gray. They're arranged side-by-side with the hot wires on the outside and the neutral wire in the middle. Attach the hot wires to the left and right terminals and the neutral wire to the center terminal. Make sure the ground strap is attached to the center terminal.

It seems to get confusing where the wires go in the back where the cord connects to on your brand new,or previously dryer that you have brought to a home thats new to you

4 wires goes as such with the red wire going on the right side,the black wire going on the left,the white wire goes on the center terminal. Now what exactly do you do with the green wires is what your asking yourself. It goes onto the cabinet after removing that little link that went from the center terminal that was beweeen the cabinet and and the white wire terminal.Yes remove that link and install the green wire where that link was just attached to a minute ago.

3 WIRE CORD


The 3 wire cord goes just like this see the 2 wires on the outsides of the cord going to the black/red wires .The wire in the middle of the cord goes on the middle terminal on the cord block

Unplug unit ..Remove axcess panel in back covering terminal block ,check and make sure all terminals are thght esp, the one in the middle (white) if three wire power cord .. If 4 prong power cord make sure middle( White wire) neutral is tight and Green wire (ground is tight to chassis frame...If still a concern you may need to replace the terminal block in the dryer or you may need an electrician to replace the receptacle or a issue in the breaker panel......

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.
A 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.

Here is a link to a very informative site
http://www.applianceaid.com/general.html#3to4

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.

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.

if its a three wire coed put the middle terminal of the cord to the middle terminal of the terminal of the block then one outside terminal of the cord to black and the other to red all that really matters is the middle or round terminal of the cord going to the middle make sure they are tight and slip the little round parts of the strain relief in the round part of the terminal block cover and put the screw in it

Yes, these cords can easily be switched. When you remove the three prong cord from the terminal block in the rear of the unit, you will wire the four prong in the same way. Black and red go to the outside terminals, white to the middle terminal, and the green wire goes to the cabinet or ground screw on the outside (usually, there is a greenish looking bolt around the terminal block door area for this to go). The only difference in a 3 and 4 prong configuration is the extra ground (green) wire. Good luck and let me know if you need further information.