A flicker suggests a bad connection, ground, a light control module (though Im not sure if 4th gen has this) or possibly a switch with a connection issue. But if it is a dimming issue:
Quote:
Originally Posted by Drcoffee
I had something like this on my 99 4runner after swapping in a new alternator. It also happened while driving, and then my lights all turned off. It turned out to be an obscure issue to do with the 3 wires that control the alternator. The white wire, that monitors the voltage had corroded and was intermittently connecting, causing voltage spikes until the wire finally broke and my voltage spiked to 16v.
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It is likely as
@
Drcoffee
said, sounds like the voltage regulator. Id rule out the battery.
Could take it to autozone or whatever for electrical system testing, Ive never done it though.