ABS & Parking Brake light on during idle

I need some help please. I just changed my serpentine belt today. Now when I started my truck to test it, the ABS and Parking brake lights stayed on while it was idling. Before I attempt to drive it, are they supposed to stay illuminated during idle? Thank you!

 

No they should not stay on at any time, you will need to get the trouble codes from the ABS module to see what's going on.

 

I should add, I just had it towed. I am reading that can cause the system to go out of whack and display the lights.

 

Towed on a flatbed or with the wheels on the ground?
It's possible a speed sensor wire got pinched or cut, you could give all the wheel speed sensors a visual check but otherwise you need to get the codes to know where to look.

 

Rear wheels up, towed on fronts.

 

That shouldn't set any codes unless the key was left on during towing.

 

Thank you sir.