Re: 4wd high not working low does.
Since 4Lo and 4Hi are at opposites ends of the shift lever, I would guess that the switch is not engaging properly on the 4Hi end.
The switch could be defective or not installed quite right. I don't know but I sure wouldn't expect there to be a separate wire from the switch to the actuator. I just shimmed mine so the two front axles are locked together all the time.
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Current/past Chevy/GMC trucks:
1958 Chevy C-60; 1965 GMC C-50; 1965 Chevy C-10; 1971 Chevy K-10; 1973 Chevy K-20; 1976 GMC C-20; 1977 Chevy C-10 Suburban; 1980 Chevy K-10; 1989 Chevy K1500; 1991 GMC V1500 Suburban; 2016 Chevy K2500 HD
Other vehicles: 1988 Jeep XJ; 2011 Toyota 4Runner
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