12 volt power for bench testing car parts?

[JeffreyNMemphis]

Hello Friends,

My clock is running slow. I think it is losing 15 minutes per day. This weekend I plan to take it out of the car and adjust the +/- to get it accurate. Which brings up this question:

What amps do electrical parts from the car need to function correctly and safely? I have a 12v battery charger with a 2 amp setting; would this work to run the clock on my work bench for a few days while I continually adjust closer to correct timing? I have other 12v power-supplies from household appliances, but don't know if the the amps would blow the clock. Also, I have some other electical parts I want to test besides the clock; what is the correct power source for bench testing automotive electrical parts?

Thank you in advance!

Jeffrey