Hi have just bought a new/used clock and before replace the old one I would like to check if it is working....

how I can connect it to the battery? + and -

I have read the clock faq but still not understand how to reduce the risk of fault clock after long sleep.

If I check the battery level before try to start the engine I can solve the problem? If i have understood the clock blow if engine start with low battery level? I have just blowed mine....

ciao