Roger, you have a heartfelt point. But, if you choose to do the project the result could be the same. If choose not to do project you will still be in buisness the next day.
If someone got hurt on your work the guilt would be far greater than if they got hurt on an existing problem.

Not to sound cold but, I would run away from that job.

cvelectric did not state that the cust is dirt poor and can't afford to have the work done correctly. He did mention the plug in the light as a short-cut.

Rob