SqueebsMcGee

Hi All, Back a few posts (and a few months ago now) you guys had a brief discussion about polarity issues powering the old 4.5v motors off the battery tenders - with the PF IR receiver in between. My knowledge of electronics doesn't quite have me 100% sure of the end result of that discussion. I've got my old 7722 set from when I was young and I've recently been inspired to get back into the lego train world. I would love to be able to run it via power functions, however the motor car that came with my set does not have the raised stud power connections as retroteccie mentions in his example. In my case, the power studs are below the "surface" level of the brick.. According to bricklink I am using a x469bopen motor, vs what I belive you guys are using/talking about the bb06 motor. I've read enough other posts that I have been considering hacking some of the power functions cables so that I could run a motor directly off a 9v battery, but I would like to stay original if I can. My question is: if I just wire up either of the powered wires from the PF cable (specifically the 9v and 0v, leaving the c1 and c2 wires to be capped) to the standard issued electrical cable that came with the train set, then I should not have polarity issues from what I can gather and should not run the risk of damaging my 4.5v motor? Polarity issues don't seem to mater in these train set between when you trip the switch on the side of the battery tender, from what I have visually understood from looking at the battery tender, the switch seems to change the output polarity which I assume then changes the motor from running forwards to backwards... I suppose the other option is to simply buy the power functions train motor, but I cann't find anything about it's brick dimensions and I have a feeling it is not 12x4x3 1/3 like my original motor (seems to be at least 2 studs shorter.. perhaps 10x4x3 1/3 or so). Also, I am keen to get this working sooner rather then waiting until september when the train motors may be off of backorder according to the lego website. And if I can run my train just by buying a PF cable and an IR receiver then I am able to save a couple bucks too.. Thanks for any help you guys can give me,