heated seat woes

[GTIPilot at aol.com]

Hi, I'm new to the list and a new owner of a 1987.5 Special Build Audi Coupe. 
 Problem I need a little help w/ is the heated seats.  Passenger side works, 
drivers side does not.  I got under the dash and checked the relays.  
Passenger side relay allows 12volts to the passenger side plug to the seat.  
Drivers side only allows 5.6 volts to the plug @ drivers side.  I have 
swapped relays, swapped plugs, and I am guessing the heating elements in my 
drivers seat may be bad.  I have a Robert Bentley Manual, but it doesnt show 
how to 'test' em to see if they are bad.  Any help would be greatly 
appreciated..

Thanks,
Brad