I have a bachmann ho railfan sp 4449 and one of the dcc decoder wires that connect from tender to engine is broken
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http://hostthenpost.org/uploads/c16a3ca5ab8bfefb8671dac24af9abce.jpg
the wires connecting the engine and tender aren't decoder wires. They are there to convey track power picked up from the drive wheels to the decoder/commands from decoder to the motor and front headlight, as well as power to the main engine from the pickups in the tender trucks and spares can be aquirred from the parts and service page of the bachmann website. The wires for the decoder are all contained inside the tender shell.
here is the large connector (from the 2-10-0 but can be used in any locomotive with the four wire and two wire connectors...
http://estore.bachmanntrains.com/index.php?main_page=product_info&cPath=66_68_158&products_id=911
here is the small one (also from the 2-10-0 but like the large one can be used in any locomotive with this style connector)...
http://estore.bachmanntrains.com/index.php?main_page=product_info&cPath=66_68_158&products_id=4185
I've had that problem for about 4 or 5 months
Unum-
You can splice those wires unless the problem is that one pulled out of the connector.
Just be sure to use very limp stranded wire if the repair is near the plugs.
-- D
My dad fixed the problem with the tender on the bachmann railfan 4449