2010 grand cherokee driver side running lights dont work both front and back but the brake and turning signals work. checked bulbs, fuses and relays also used a volt meter and im getting 12v from everything except running light hole which reads 3.5 v

 

Hello fmo90, and welcome to the CherokeeForum!

You probably know what you're doing but I need to ask anyway.

Are you sure you checked all associated fuses? Fuses are located in more than one panel/box. If uncertain then you should take a few minutes more to review the owner's manual (or RTFM as I like to say).

Are there any after-market accessories added to your Jeep that need a power supply? For example, it is common to tap driver-side running lights for power to things like a lighted visor. I also have seen them tapped for power to aftermarket alarms. These things can "pull-down" power from the tapped circuit, especially if defective or not set-up properly.