The engine file is a 7FLD-16 - Decoder ESU
Begin by removing the couplers from both ends noting the rear coupler with have a air hose that is bet removed and placed in the lid until reassembly. With the couplers out remove the two [2] screws located near at both ends. Place to once side with the couplers.
Next pull the lid off carefully starting at the rear moving to the front. You will find the front a tougher but it will rock off and then place beside the mechanism.
Note: Be careful here as the headlights are plugged into the main PCB and the lead are quite short and if damaged cannot be repaired
Mark one ot the plugs with a Sharpie so you can reassemble in the correct order. Remove the both plugs with a small chisel screwdriver and place body to once side
Next remove the factory DC 21 pin jumper and then install the 21 pin decoder.
Note: Pins are inserted through the the PCB board.
Solder two lengths of wire to the speaker then to the two speaker connections on the factory PCB. Install the speaker into the factory speaker enclosure threading the wires through the front slot, seal this opening with a dob of silicon and allow to dry.
Solder the speaker wires to the two speaker points on the factory PCB. Thread the wires in between the gap between the speaker enclosure and the frame on both sides. Once fitted cover with a piece of electrical tape to allow the shell to fit over.
Test the lights and the sound then refit the plugs to connect the headlights in the shell and retest the lights.
Once satisfied refit the shell from the rear and then over the speaker - this will be a little tight but will fit.
Reinstall mounting screws then the couplers, finally refit the air hose with a drop of ACC.
Retest and set adress
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