first nova 1978 have questions

Did you look at the dimmer switch, asumming it's the foot operated switch, any signs of corrosion or a melted connector? Did you try running a temporary ground from the headlight ground wire to the negative battery terminal?
 
If just the high beam on the drivers side is not working it could be a bad head lamp. Check for power in the terminals at the plug between the black ground and the terminal with the green wire. If there is power on the green wire the lamp is bad.
 
Here's the update I got a ac delco signal switch from eBay 17.00 and I just unplugged my harness at the steering wheel and plugged in the new one same results.
 
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