If you purchased this locomotive new, there should be an exploded assembly diagram in the box it came in.
There's a possibility that one or more wires from the front truck has come loose from the circuit board or from the truck side frame pickup wipers. These wires are usually just held in place by small, slip on plastic clips.
Remove the clips and solder the wires at both ends for more reliable operation.
Steel ManI have a genseis SD45-2 diesel Loco and I don't have electrical power to the front truck unit. When I pick up the back truck unit the unit stalls and therefore when I cross turnouts etc. the unit dies. The wires look like they are properly connected but I don't know how to take the truck unit off to look to see why it is not picking up power from the track. Can anyone give me any guidance as to how to fix this issue or where to look. Thank you Gary
I have had the same problem on 3 different diesels over the past few years.
On one of those locos, while all of the wires leading to the trucks looked to be intact, one wire in fact was loose. Once I soldered the wire into place securely, the problem was solved.
In the second instance, it turned out to be a decoder problem and I returned it to the manufacturer for repair since the decoder was factory installed and still under warranty.
In the third instance, I was convinced that the truck wiring was solid, and I didn't want to incur the time and expense of sending the loco back to the same manufacturer for decoder repair since it was out of warranty. So, I soldered a jumper wire on the decoder so that all four of the trucks were powered that way. That worked, so I let it go at that.
Rich
Alton Junction