Check all the grounds in the engine area for good connection.
"The 4 main ground ties and positive leads.
#1. (-)Braided block to body ground, deck lid hinge. The main braided strap is critical.
#2. (-)Trans to body. The trans to body is a backup.
#3. (-)Battery to body. Battery (-)post to tray.
#4. (-)Battery to engine block. The big batt cable (-)post to bolt on engine hoist hook.
Positive leads (+)
#5. (+)Battery to starter
#6. (+)Battery to main terminal below C500.
#7. (+)Alternator feed to main terminal below C500.
NOTE. The Ogre has mentioned that if #7 is bad, you will get large voltage drops under load just like a bad ground. We all know what bad grounds do to a Fiero's electrical systems!"//www.fiero.nl/forum/A...041015-2-052227.html