1. Cessna 172 is the most sold aircraft to this moment.
2. B737 requires at least basic system knowledge even for the simplest failures (e.g. generator failure) due to lack of ECAM/EICAS. If you get 10 lights at the same time, it's most likely due to a single (electrical) failure and you don't need to do 10 NNCs.
In any case, using your system knowledge, you can do the following workflow (repeat as neccessary):
Warning Light -> Identify and decide on main reason -> NNC -> Recall -> (if any lights illuminate or remain illuminated) -> Identify ... -> NNC -> Recall -> ....
As for continuing to do checklists... Fuel & Hyd pumps, etc. simply won't work if they don't get electrical power. You may be able to start APU at lower (than cruise) level and then proceed to destination with APU running. In this case, you just put APU GEN on bus and you don't need to reconfigure half of the cockpit again to get things normal.