Bad ground/alternator?!
Thread Starter
Teching In
Joined: Sep 2025
Posts: 14
Likes: 0
From: Janesville, Wisconsin
Bad ground/alternator?! (I think I put my first post in the wrong forum)
Earlier this year I got my first F-body (2002 z28) recently the lights began to fade and flicker while the car was idling so I replaced the alternator with a power master 120 amp alternator, but now I’ve noticed that whenever I rev to a high rpm all the lights in the car get noticeably brighter, and then dim back down as rpms drop, is this a normal thing for these cars? or do I have another issue I have to address?
Earlier this year I got my first F-body (2002 z28) recently the lights began to fade and flicker while the car was idling so I replaced the alternator with a power master 120 amp alternator, but now I’ve noticed that whenever I rev to a high rpm all the lights in the car get noticeably brighter, and then dim back down as rpms drop, is this a normal thing for these cars? or do I have another issue I have to address?
TECH Fanatic
Joined: Dec 2017
Posts: 1,467
Likes: 265
From: Bossier City, Louisiana
Yes, wrong forum. Take this alternator to any well equipped auto parts store and get it tested. This will be a brief full field test, a low voltage test and a "ripple" test to see how much alternating current is leaking past the diodes in the rectifier. Do you have a multimeter and know how to use it?
Rick
Rick
