DCC connections


I am trying to put a Phonex sound system a P8 in a G scale Bachmann Heisler locomotive. It has a DCC board in the coal tender with 12 screw down connections 1-12.
I’m wondering if there is a chuff connection on one of the lugs an which ones is track power. Does anyone have a idea about the connections. I checked with Bachmann and they don’t have a schematic available.
I do track power not DCC so I don’t need a sound card for DCC.
Advise Don

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