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Hi Capt
You need to invest in a multi-meter , if you don't already have one
Test for electrical continuity between the motor brush contacts or terminals (where you solder the Orange and Grey wire to ) and the power pickups from the Track
For steam loco's , after removing all wiring , I sit them on a piece of track , put one lead on the motor brush contact (terminal) and the other on each of the rails in turn , If no electrical continuity (short circuit) then you can solder on the decoder wires without frying chips
Hope this helps
Regards Zmil
You need to invest in a multi-meter , if you don't already have one
Test for electrical continuity between the motor brush contacts or terminals (where you solder the Orange and Grey wire to ) and the power pickups from the Track
For steam loco's , after removing all wiring , I sit them on a piece of track , put one lead on the motor brush contact (terminal) and the other on each of the rails in turn , If no electrical continuity (short circuit) then you can solder on the decoder wires without frying chips
Hope this helps
Regards Zmil