I have been approached offline by a member looking for some help with a CC-M installation in his LM Challenger. This is a 2004 offering and it has something I have not seen before; a bridge rectifier in the interconnecting motor wiring between the two power trucks. The following sketch shows how they are wired:
It appears that the bridge adds two diode voltage drops to the power going to the front truck, in either direction. But the nagging question is; why would you want or need to do this? Also note the unusual DCDS designation: YD2 EDP.
I happen to have the earlier 2003 version of this engine, 6-38021; and it does not have the bridge diode. And the DCDS in it is the standard YU1 version. Even more interesting is the parts list for the 2004 engine calls up the YU1 DCDS, but that's not what it has in it.
Can anyone shed any light on all this?