This particular model came with a pre-installed ESU LokSound V4 decoder. The model was upgraded with the following items:
ESU (58420) LokSound V5 8 pin decoder,
ESU (54671) Power pack Mini / stay alive unit,
DCCSound (S-105) Premium twin driver speaker (4 ohm).
The tender jacket was removed from the tender floor via two screws on the underside of the tender. The new decoder was hardwired to the following leads:
Black: LHS track power (engine and tender)
Red: RHS track power (engine and tender)
Grey: Motor #1
Orange: Motor #2
Yellow: Front headlight (switchable function)
Blue: Common positive for headlight
Brown: Speaker wires
The decoder was then updated with the latest R class project, and following successful testing, the tender was reassembled.