my fc has multiple electrical issues and i need help solving them

1) Recently my fc's security light stopped working. if i unplug the battery and replug it it starts working again but only for about a day.

2) if i do pulls on my fc occasionally all my warning lights turn on past 5k rpm for no reason. including seatbelt, hatch everything. but once it revs past 5k its back to normal. this issue happens fairly often

3) my stereo just stopped working out of nowhere. no power what so ever

if any of you guys know how i can fix this issue i will greatly appreciate it

i have a 1990 gtu and its completely stock

 

I'd start with the connections at the battery terminals.

 

the battery terminals are pretty clean.

 

Check your alternator and belt.

 

i just checked it and that also seems fine

 

Sounds like a voltage regulator. I assume it is part of the alternator on rx7's, but I am not sure. I would pull the alternator and get it tested for free at autozone/pep boys anyway. Plus then that will be a known yes or no path to take.

 

dope i'll do that and keep you updated. thank you so much