I have a 99 Blazer and all of a sudden my driver side power seat quit working along with my lunbar switch to any suggestions.

Check for power and ground in the electrical connector at the seat switch.

I have 8 volts it looks like there were 10 wires running into the power seat switch i tested the orange and black wire

Make sure the battery is fully charged. It should be around 12 to 12.5 volts. If it is fully charged, a reading of 8 volts at the seat connector is too low. Check for a poor connection in the feed wire and/or ground wire. There is a connector under the carpet in the drivers feet area that has been known to cause problems with corrosion.