I have a 97' Civic with power door locks. Sometimes they would work correctly, and sometimes they do not work at all. They would not work at all right now, and then when I put a battery charger on the car they began to work again. Does anyone have any idea what the problem could be? Thanks for any help.

 

Any ideas would be appreciated, thanks!

 

If the battery charger is making a difference, I'd check the battery connections and also check and clean the grounds.