Originally Posted by rcorn1031

I have on ‘07 Silverado and had similar issues that stemmed from corroded fuses and loose harness connections underneath the “Under hood” fuse panel . In total I had 6 fuses and 3 relays that had corroded / Intermittent connection issues . I found the fuses that looked good by doing a continuity on each fuse . And I found the relay issues with the relay bypass/test set I have .
As i was checking the fuses and relays I was also applying an anti corrosive compound ( Truck -Lite NYK 77) to each fuse stab and socket as well as the relays stabs and sockets And the harness connections underneath the fuse panel .
After having done all this everything that was malfunctioning has worked ever since .
It does take some time to complete but is well worth the investment in time .
I used Q-tips to apply the compound .
Best wishes and Luck , I hope this helps you both .