Check the "FAN E" 20 amp fuse in the fuse block left side under the driver side dash. This is the fuse for the GT "PONTIAC" lamps and the blower fan on the passenger side of the trunk. Sometimes if the fan goes bad it will blow the fuse. You can just disconnect the fan and replace the fuse.
The power then goes thru pin G9 of the C500 connector.
If fuse is good,
Check the brown wires on the blower fan for +12V, If you have +12V then the problem may be a grounding issue for the lamps.
The schematic is on page 8A-110-4 of the 1986 Fiero Service manual.
You can download it here: http://www.fieronews.net/fu...nloads.php?cat_id=13
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[This message has been edited by Oreif (edited 05-20-2008).]