2005 Suburban LT
 

Doesn't seem like there's a lot of replies to people's questions. These days, but I'll ask this one anyway. I have 2005 suburban 5.3. And I'm getting intermittent warning lights coming on ABS BATTERY ANTI-THEFT you name and its come on along with headlights dimming and returning to normal and intermittent a/c issues including rear. Also jumping speedometer and tach. Sometimes my gauges just go dead and then come back on. I've had the wiring harness looked at but some people say its the BCM. Has anyone had these issues. One other note is that the truck runs perfectly fine. Any thoughts would be appreciated.