...just in case anyoe was wondering.

I don't have any aftermarket radio BS installed either.

Just sitting at idle, if you have even one interior light on and you activate the power seat....BIG dim/blip from the interior cabin light. The engine also sounds like it groans a bit too.

Still, this is the only time this happens and of course does not outweigh the fun factor of the pulley!!

One note, when the lights dim, the volt gauage only drops about 2 volts and is still well above 12.

 

Power seat = Power *****.

~AJ

 

Had the full pully set for 10k miles, never have experienced lights dimming etc
with stock battery no noted voltage drop at idle either.

 

i notice it when i use my power windows, but i forget if it happened before i switched pulleys. who cares?

 

This does seem like a believeable thing to happen. At idle the alternator is spinning pretty slowly even with a stock pulley. However, they are designed to be able to put out a reasonable amount of power even at that slow speed. However, with an underdrive pulley you are spinning it even slower.

Do this: hold your rpms higher (at 2k, for example), then operate your power seat. Do the lights still dim? If not, then I'd say your pulley is just spinning the alternator too slowly at idle. You could probably help this by increasing your idle speed a bit. Maybe kick it up a couple of hundred rpm or so.

 

For example , those in a cold climates may notice the dimming more so, since battey output is directly correlated to temperature. At cold temps the battery voltage can sag and requires more charge from the alternator when under load (ie power window operation). Slowing the alternator at idle via the UR pulley would be most noticeable in cold climates. In Nor Cal, were I'm at ,batteries last much longer than say Pa and pretty much sag very little during ther >5 year life span, hence why I never see dimming with my IR pulley. If you ever want to upgrade your battery , I woudl recommned Optima, they are lighter and hold a cold charge better.