Noticed the other day when I started my truck as it sat at idle that the lights and blower motor (fan) where fluctuating as it sat there. RPM's stated the same anybody ever have this problem?


2004.5, Quad Cab, 4 X 4, Banks Hi Rise, Triple Gauge Piller, 315/70/17 Firestons A/T's on 10" Alum Rims

 

mine does it all the time when i first start the truck it is the grid heater coming on and off it will only do it for a 90 seconds