3ed break light works lowers dont. Cruse control works. Can the break light switch have proper function in cruse control and 3ed break light but not lowers? Checked 2 fusses under hood and one just inside drivers door, good...is there a lower break light relay besides the switch on break peddle? I cleaned up the grounds under thr rear of the truck that aren't bad to begin with but to no avail. Any help with this 07 tahoe would be greatly appreciated.