So i got an 03' 2500HD gmc sierra 6.0 This is my issue- When I turn the key, nothing at all happens, Lights turn on but starter wont tick. The battery is good, fully charged. I checked all fuses and connections, all is well. The starter does work, I brought to napa to test, and works perfectly. The starter won't budge. I checked for power, and it seems to be getting power. IS there anything that I am missing?