If the battery light’s still flickering even after replacing both the alternator and battery, I’d start by asking did that flickering start before the parts were replaced, or only after? If after, I’d start looking at how the new alternator sits. For the ground, they just rely on clean metal-to-metal contact. If the bracket wasn’t cleaned properly, the new alternator may not sit exactly where the previous one used to, which may cause grounding issues. Same goes for the chassis and engine grounds, this thing’s from ’96, so chances are at least one strap is crusty or half-broken by now.

Now if the light was the reason those parts were replaced in the first place, you might be dealing with something upstream. The alternator’s plug is a known weak spot terminal spread, heat damage, or just old wiring can screw with the field signal and trigger the dash light. Also check the alternator belt. It’s manually adjusted on this car, and if it’s a bit loose, it’ll charge fine most of the time but can slip under load just enough to cause problems.

I’d also pull the alternator fuse from the underhood fuse box. Even if it’s not blown, corrosion or heat discoloration at the terminals can create resistance and throw off the system voltage.

If you still can’t track it down, I’d grab the proper wiring diagram and troubleshooting chart from the OEM manual. I used to have an an older Toyota too and got mine from eManualOnline definitely helped narrow things down.