My new chassis (40007) does not have the Chuff Drum on either of the axles. I do have an additional question. I know that the wheels on the pilot truck have electrical power pickups but I also thought that at least one set of the main driven wheels also have power pickups. If this is true, then my new chassis is not working correctly. I have not disassembled the cover on the bottom of the chassis yet but I did set up the chassis on a set of 4 test rollers, all electrically connected but when I slid a piece of paper under the pilot wheels, my chassis stopped rolling. When I remove the paper, the chassis runs which means to me that the driven wheel pickups aren't working. I'll remove the bottom chassis cover tomorrow to investigate but I'm fairly sure that something is amiss!

Since this post was from back in September, you may have already found your answer on the connector types for this board but in case no one else has responded yet, these are called JST Connctors. This stands for Japan Solderless Terminals. If you have the patience to search for them, you can go to one of the huge Electronic stores such as Mouser or Newark among others. I had some on hand from another project from several years ago but the tricky part here is that Bachman uses several different sizes of JST's along with different quantity of pins on these. I went to Amazon and after measuring the spread between each pin with digital micrometers, I ordered sets of each size to have on hand for future projects. There are so many sizes to choose from but Amazon has sets of each size relatively inexpensive. You can buy anywhere from 1.5 mm to 2.54 mm and any2here in between.

Quote from: deritchie on September 23, 2025, 06:31:45 PMTo get back to the question - I still don't have thw two wires hooked up for the smoker on the original cab. I suspect that this should be connected to the left SMK+ connector, likely with the red wire to the right. I was rather surprised that there wasn't at least a sheet
of documentation for that board since it is likely to be used to retrofit older trains.
Also would be nice to know where sort of connector is used on the board, and sources for the wire ends connectors that match (and a likely source for same such as Mouser or Digikey or Newark).

Quote from: deritchie on September 23, 2025, 06:31:45 PMTo get back to the question - I still don't have thw two wires

Quote from: deritchie on September 23, 2025, 06:31:45 PMTo get back to the question - I still don't have thw two wires hooked up for the smoker on the original cab. I suspect that this should be connected to the left SMK+ connector, likely with the red wire to the right. I was rather surprised that there wasn't at least a sheet
of documentation for that board since it is likely to be used to retrofit older trains.
Also would be nice to know where sort of connector is used on the board, and sources for the wire ends connectors that match (and a likely source for same such as Mouser or Digikey or Newark).

hooked up for the smoker on the original cab. I suspect that this should be connected to the left SMK+ connector, likely with the red wire to the right. I was rather surprised that there wasn't at least a sheet
of documentation for that board since it is likely to be used to retrofit older trains.
Also would be nice to know where sort of connector is used on the board, and sources for the wire ends connectors that match (and a likely source for same such as Mouser or Digikey or Newark).

Thank you for your response! From earlier searches, I assumed that no schematic available was probably the answer.  I also assumed based upon many years of electronics experience that the two and three pin connectors were exactly as you described. I just wanted a better explanation if possible from the factory. So I'm assuming that on my older model, the three pin connector does absolutely nothing then? If this is true, then you've granted my every wish and I truly thank you, sir!

I have a 15 year old Bachman Big Hauler, number 177 that has served me very well until 6 months ago. The motor died so in August, I ordered a new Chassis, 40007. I recently tore into my Bumble Bee to swap the old chassis for the new chassis. This was a fairly easy process until I discovered some of the mounting posts inside of the body broke up while removing the screws. I tried to reattach the remaining posts with super glue but none of these would hold up when I inserted the body screws so I decided to order a replacement body also from Bachman. The only body available in the Bumble Bee scheme was a 4-6-0 Anniversary body so I ordered that. Knowing that I was going to have to rewire the headlamp to make it an LED and since my old smoke unit was bad also, this seemed to be my best option. When the new body arrived, I got back to work on my rebuild. I realized that the new circuit board for the new chassis had what appeared to be JST connectors for the various inputs & outputs so I had a few sizes of JST's lying around and I had to order a few new ones to make sure I had enough connectors. The number on this circuit board is G912X-PCB06-A. So my question to Bachman is, do you have either a wireless no diagram or a schematic of this board that I can print out? If not, I need some guidance on each of the four JST connectors located in the middle of this board. I assume that the 2 pin connector on the far left,labeled as SMK+ goes directly to the new Smoke Unit. The second from the left is a 4 pin connector labeled SWITCH/LED and the third from the left is a 3 pin connector labeled as Sensor. I can't figure out where these two connectors go. The last is a 2 pin connector which is on the far right edge of the board is labeled as Trigger. Can I assume that connector goes to the Tender connector for the Chuff Trigger?
I appreciate your help and support with these questions!  Thank you,Steve Johnson