2 truck shay replacement trucks

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I have a 2 truck G scale shay which needs the replacement trucks that Bachmann offers.
Does anyone know if the installation is pretty simple ? Are there instructions included with the power trucks.
Thanks for any help.
Ketch

[smcgill]

Not too bad.
When I did mine it said red wires goes to red and black go to black.
So I open up the truck and I have two black wires 
I had  friend with a meter help.
Worth the trouble!