Where do I attach KeepAlive wires to the decoder in a Bachmann 44 Tonner?

[Br 98.75]

It has to have a keep alive property like in there KA series or a sound decoder the capacitor  it can blow the decoder if you install it  on a non ka ready board or sound with capacitor

[richg]

Decoders have a blue wire for common positive voltage. You have to find the negative side of the power on the decoder. Those two points are attached to the filter capacitor that filters the pulsating DC voltage at the full wave bridge.
Look at the photo I posted. That is where the stay alive attaches. I have done this.
I traced the circuit with a multimeter and used an Optivisor for better viewing of the decoder circuit.

Rich