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I think we'd need to know a bit more about the symptoms to better diagnose this. Does the engine only stall at idle? Does the stall behave differently if the car is in neutral or in gear (like stall just as it's going into gear)? Do the revs drop briefly before it dies? Do the dash lights come on instantly when the A/C (or seat heater) is engaged or is there a short delay? Is this problem worse when the engine is hot or cold? Will the car (re)start with the A/C (or seat heater) on or do you need to depress the accelerator to get it to start?
I'm not so sure it's an electrical issue as you suspect. Without further details, I'm more inclined to guess the idle control system isn't functioning properly. That's by far a more common problem area for stalling with load. With the engine off, you should hear a click from the throttle position switch (TPS) on the back of the throttle body (TB) just as you start to open the throttle and again as it returns to its stop. If this doesn't happen then the ignition system simply has no idea it is supposed to be maintaining idle and the TPS and/or entire TB linkage would need adjustment. Additionally, if the TB (and the associated PCV system including the flame trap) is dirty or if the throttle stop screw is adjusted too far in then there will not be enough base bypass air around the throttle plate to allow smooth transition to/from idle. TB cleaning is a regular maintenance item that is often ignored -if it hasn't been done in recent memory then a thorough cleaning (with TB removed) is in order. And finally, if the idle air control valve (IAC) is dirty or worn then it may have sticky zones where the ignition system can't maintain proper idle under load.
If you go to the OBD section of the 700-900 FAQ (upper right feature pull-down menu) there's a whole section on how to use the on-board diagnostic system at the black box(es) behind the left front strut. Scroll down the list in the OBD section and you'll find a set of procedures you can run to verify operation of the TPS and the IAC.
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Dave -940's, prev 740/240/140/120 Never overestimate what little I know.
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