There is a somewhat obscure note on PowerBook power adapter sense circuits at
http://developer.apple.com/qa/qa2001/qa1266.html which specifies clearly where the +24V and Gnd connect to the augmented sense shell equiped stereo plug. For the 45W Yo-Yo supply, the ground shield of the coax is gnd, inner wire is +24. Note that the coax cable ground shield does not connect to that outer sense shell of the plug. I measure approximately 410K ohms between that sense shell and coax ground shield on the temporarily disconnected plug of a 45W M7332 Yo-Yo supply I am repairing tonight, probably a small 412K ohm programming resistor potted within the plug.
http://developer.apple.com/qa/qa2001/qa1266.html which specifies clearly where the +24V and Gnd connect to the augmented sense shell equiped stereo plug. For the 45W Yo-Yo supply, the ground shield of the coax is gnd, inner wire is +24. Note that the coax cable ground shield does not connect to that outer sense shell of the plug. I measure approximately 410K ohms between that sense shell and coax ground shield on the temporarily disconnected plug of a 45W M7332 Yo-Yo supply I am repairing tonight, probably a small 412K ohm programming resistor potted within the plug.