I've looked all over the internet for wiring diagrams on the 4.9L Seville when doing the wiring for my swap. I couldn't find them anywhere, plenty of Deville wiring diagrams. But they are really different. My particular engine was from a '92 Seville STS, so I decided to post up diagrams I got from Demand 5, hopefully they will help someone else out in the future.
1992 Seville Charging Circuit
1992 Seville Instrument Cluster
1992 Seville Ignition Switch
1992 Seville Fuse Circuit
1992 Seville ECU and powertrain control
1992 Seville Alternator
1992 Seville Cooling Fan Relays
And here is the info I dug up on the Fiero side:
88 Fiero Starting Circuit
88 Fiero Charging Circuit
88 Fiero ECU
88 Fiero Instrument Cluster
88 Fiero Cooling Fan Circuit
Please feel free to use these for your own personal needs or in your forum threads and how to builds.
Chris