The 232 & 233 are the same with the exception of the coupler height. The 232 was compatible with the 2650, 2750, & 2950 series of cars, whereas the 233 was only compatible with the 2800 series cars, which had different height. I did a Google search on "Magic Electrol", which is what I think you are looking for. I am not familiar with your combination of loco and tender, but I am going to assume that there is a relay in the tender to use "Magic Electrol" to control the train. Below is a link with explanation and diagram:
http://www.toytrainrevue.com/relay.htm
See if this helps.
Jerry
Our community is FREE to join. To participate you must either login or register for an account.
Get the Classic Toy Trains newsletter delivered to your inbox twice a month