Replaced all turn signal and brake light bulbs. The wiring and connectors look excellent. No corrosion of any kind that I could find. the left signal indicator still stays on. when you signal a left turn it does not blink although you can hear it. The signals work as they should including sequential brake lights. I don't know anything else to check. Nothing else like running or fog lights have been added or removed that I can tell. Unless anyone has any suggestions I guess it is off to the shop.
Thanks for looking!