May also be the belt slipping at high RPM's. Check the pulley on the alt. for wear. I assume you put belt and checked tensioner during 3L swap.
But FWIW, my lights dim at low RPM's and flicker a little at high RPM's.
I have an extended wtty and I figured it will fail soon. The car has 69000 miles on it now and still hasn't failed. Weird. If it failed now I will get if fixed for $50. If it fails after 100k miles, I will eat the entire cost. Of course, the dealer won't fix it now because the voltage is in range, but max high at medium RPM and max low at idle and high RPM. The flickering is darn annoying though. I may eat it and replace the alternator anyway.
My name is Richard. I was a Contouraholic.
NOW: '02 Mazda B3000 Dual Sport, Black
BEFORE: '99 Contour SE Sport
Duratec ATX Spruce Green
PIAA 510's, Foglight MOD, K&N Drop-in
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