2000 Suburban Electrical issues

My 2000 Suburban will occasionally have electrical issues. During normal driving, the speedo will go to zero, the battery and air bag lights comme on and there seems to be a very slight power loss. This will happen for only a very short time and then things go back to normal. I'm afraid this may be a sign of bad things to come orit could be simple. Anyone heard of this before I pay $75 just for the dealer to look at it?

Sounds like a bad electrical connection. Start at the battery.check and clean. Check ground connections. Check wires at terminals and at fuse box. Check under dash and at dash connector.