Be sure that the power distribution box has sufficient power provided to it. Long cable runs can result in a voltage drop, which can be solved by using a heavy gauge wire. Be sure the clasp is not closed on insulation and. If you just installed your own new electrical box, and things aren't working properly, it's not fun. The good news is that most issues are easy to troubleshoot, especially if you follow the steps below. You. If your circuit breaker is on, but no power is getting to your outlet, light, or appliance, there is a simple process to go through in order to find the culprit. As a 29-year seasoned electrician, I'll walk you through exactly how I always approach the issue. Do not touch live parts, turn off the corresponding power switch to avoid the risk of electric shock. Unplug them all and then try resetting the.