Jeff,
The circuit you describe is typical of most alternator circuits.  GM
and Ford use a resistor in parallel with the bulb.  This sets the proper
resistance for the circuit.  The details are in the TE/AE SUNBEAM SURVIVOR.
 Perhaps Nissan is using the relay coil for the same purpose.  If you
would like I can look up the resistance for the GM unit.
Tom Calvert
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