i haave two HO bachman ATSF gp40s. they run fine separetly but when i put them both on the the track and i doublehead them they get all jerky under a little more than 1/3 power. does anyone know how to fix this problem. another thing is that one of them came DCC ready and the other didnt. could this be a factor?
Put the two engines on the track about a foot apart with no cars attached and start turning up the voltage. I suspect the decoder equipped engine doesn;t move before the other one. If that is true and you aren;t using DCC see if it is removable. If not you have two choices. Try the nondecoder equipped engine in the lead to see if that smooths thing out or add resistance across the leads to match the decoder equipped engine. the resistor will equate to the voltage drop across the decoder
The jerky performance when the two are coupled together can easily be from a slight difference in engine speed. If one runs slightly faster than the other, run that one in front. It will keep tension on the couplers between the locos, even going down hill.
could you tell me how to remove DCC…
there are wires going to J1 + and -
T4-, T3+, D2, and J2+
Unfortunately, trying to remove a DCC decoder is asking for real trouble unless you are experienced at soldering and know exactly which wires need to go to what locations. You should either convert to DCC or stop purchasing engines that have decoders already installed, especially some of the really cheap DCC decoders such as Bachmann.
will two non DCC engines have this problems???