[Robotgroup] BS2 to Sabretooth 2x10 RCMC?

[LHudson]

Ugh.
 
It has two speeds:  really fast, and backwards really fast.  
 
' {$STAMP BS2}
' {$PBASIC 2.5}
DO
  ' !-- Execute a Movement Command
  PULSOUT 13, 750
  PULSOUT 14, 750
  PAUSE 20
LOOP
 
Anything >= 750 makes the motor go really fast.  Anything < 750 makes the motor go backwards really fast.  Responses posted to Parallax or Lynxmotion forums imply that the Sabretooth responds to the PULSOUT command in the same fashion as the BOE-BOT CR servos.  Just about every post seems to be resolved with "I connected it to the BS2 Ground and now it works".  However I don't see anything that looks like this in the wiring diagram.  Is this because they are using the Sabretooth 2x10 MC and not the RCMC?
 
Also, it is impossible to stop the motors without yanking the wires leading from the RCMC to the motors.  I believe that turning off the BOE also stops the motors however usually I'm in some sort of panic state and forget to confirm this conclusively by writing it down or something.  If I disconnect the wires leading from the MC to the battery, the green power indicator LED remains lit.  However if I then switch off the BOE or disconnect the servo leads, the green power indicator turns off.
 
These are the documents for this MC:
http://www.dimensionengineering.com/datasheets/Sabertooth2x10RC.pdf
http://www.dimensionengineering.com/datasheets/Sabertooth-2X10-RC-diagram.jpg
http://www.dimensionengineering.com/datasheets/Sabertooth-2X10-RC-DIPs.jpg
 
I am using this battery:  
http://www.hobbymasters.com/index.asp?PageAction=VIEWPROD&ProdID=382.  
 
Googling "Power Wheel 6 volt" returns a lot of batteries that are red, but mine is Blue.  I forgot to check last night to see if it was NiCD or Li.  I asked Bonnie to look and and she said neither -- "Pb".  
 
Anybody?

L. Scott Hudson
 
"There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things we know we don't know. But, there are also unknown unknowns. These are things we don't know we don't know." 
 
-- Donald Rumsfeld, describing the IBM "Rational Software" Platform