2005 Chevrolet Silverado 2500 HD Q&A
2005 Chevrolet Silverado 2500 HD Question: no trailer brake lights
You need to get out your meter and find where you're losing power or ground. It's likely to be a faulty connection somewhere under the truck. You may need to find an auto electric shop or consult a GM specialist for help. If you want to find a specialist, here's a directory link for you: https://repairpal.com/directory?address=55372&car_brand_names=Chevrolet - Superbob
Also the check engine light and all the gauges going on and off. Sometimes transmission won't even work,I have been to dealer and they can't find anything I have had it back 6 times!