Most modern window motors require between 5 - 10 amps of current to work properly. If you are using this for 30 year old window and headlight motors, I would guess something in the 10 - 15 amp range would work. A "wall-wart" will just not have enough power to run them correctly. I would use something like this:
https://www.amazon.com/gp/p...42fe3c20a62&pf_rd_p= f8d74dbd-1c39-59cb-af7f-242fe3c20a62&pf_rd_i=318022011
or this if you have the money to spend.
https://www.amazon.com/gp/p...212f460556ac&pf_rd_p =8b3652c3-eaf3-5daf-982f-212f460556ac&pf_rd_i=318022011
[This message has been edited by computer_engineer (edited 10-17-2018).]