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What? 4 Wires? S1... A2... Huh??? 
Confusing isn't it? Well hopefully the following diagrams and explanation will clear up the often intimidating and misunderstood concepts involved with ours motors and how the F&R switch functions.
The first diagram shows a series motor connected to a battery. Our motors do not have permanent magnets like many DC motors you might be familiar with, but instead use "electro-magnets" to create the motor's North and South poles by passing current through the field coils (S1, S2).
The next diagram is essentially the same as the first, but note that the positions of the armature and field coils have changed. This does not affect the operation of the motor. The same amount of current will flow through the circuit and in the same direction. The four Dots represent the ends of the four wires that connect to the F&R switch. The lines between them represent the inner workings of the switch. Lets assume the switch is in the forward position and the carts moves forward when the Go pedal is depressed.
The last diagram depicts what happens to the flow of current when the switch is moved to the reverse position. Current is now flowing in the same direction through the armature, but in the opposite direction through the field coils. This reverses the North & South poles created by the "electo-magnets" and causes the motor to spin in the opposite direction. The F&R switch can be placed in the circuit so that it switches the direction of current flow to either the armature or the field coils, the result is the same.
*Note that the drawings below are conceptual representations of the motor/switch circuit and that the positions of S1, S2, A1, A2 may or may not correspond with how your cart is actually wired.
**If you have a regen, sepex, compound motor, etc. then the diagrams do not directly apply to your application as the methods used to energize the coils are different.
Confusing isn't it? Well hopefully the following diagrams and explanation will clear up the often intimidating and misunderstood concepts involved with ours motors and how the F&R switch functions.
The first diagram shows a series motor connected to a battery. Our motors do not have permanent magnets like many DC motors you might be familiar with, but instead use "electro-magnets" to create the motor's North and South poles by passing current through the field coils (S1, S2).
The next diagram is essentially the same as the first, but note that the positions of the armature and field coils have changed. This does not affect the operation of the motor. The same amount of current will flow through the circuit and in the same direction. The four Dots represent the ends of the four wires that connect to the F&R switch. The lines between them represent the inner workings of the switch. Lets assume the switch is in the forward position and the carts moves forward when the Go pedal is depressed.
The last diagram depicts what happens to the flow of current when the switch is moved to the reverse position. Current is now flowing in the same direction through the armature, but in the opposite direction through the field coils. This reverses the North & South poles created by the "electo-magnets" and causes the motor to spin in the opposite direction. The F&R switch can be placed in the circuit so that it switches the direction of current flow to either the armature or the field coils, the result is the same.
*Note that the drawings below are conceptual representations of the motor/switch circuit and that the positions of S1, S2, A1, A2 may or may not correspond with how your cart is actually wired.
**If you have a regen, sepex, compound motor, etc. then the diagrams do not directly apply to your application as the methods used to energize the coils are different.
sonicj!
LOL! Glad to know at least somebody out there appreciates what i have to say. 
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