I thought there was only one way to install the tender-locomotive connectors but my 4-8-2 heavy mountain runs backwards. which connectors did I misconnect with my fat fingers ?

I have the MRC Prodigy Advance 2 system

Do HO 82506  4-8-2 's supposed to have a light on the back of the tender ?

Perhaps the pin used on tenders for the drawbar should be made of metal ? I have had two break already ( 4-8-2, 2-10-0 russian Decapod) from handling.