Can you adjust or cut back on your hours? Can you work from home? Maybe your son can also begin to work part-time while you're working. One friend of mine was having a terrible time with her daughter. She allowed her to homeschool, but also required her to work. It did not take very long for the girl to realize that if this was what working entailed (it was a boring job), she'd better get serious about her studies and at least obtain a high school diploma.
If you decide to give home learning a try, there are independent study programs and correspondence schools that can help your son work towards a high school diploma. Perhaps he might want to obtain his equivalency diploma (GED). To find online support for the GED test, visit www.gedonline.org. Another good resource is Cafi Cohen's book, Homeschooling the Teen Years: Your Complete Guide to Successfully Homeschooling the 13- to 18-Year-Old. Good luck!