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No idea what is wrong with yours but things that prevent sound are the two audio boards, the volume pot, the speaker plus all the interconnected wiring. Also make sure the audio boards are installed in the correct location. Unlikely the radio board is bad if the engine moves.

As for Cruise you would pretty much have to bin those boards and replace with ERR Cruise Commander and Railsounds these days.

Pete

Thanks- i tested the pot switch and it works ok- the speakers (8 ohm 0.25watt) is reading 4Kohm so I think that might be the problem- worth a shot. I have found an exact replacement:

https://www.digikey.com/en/pro...me-sky/GF0506/304435

Would you use an exact replacement- or is it worth trying something like this which was recommended previously as a 'better' speaker?

https://www.parts-express.com/...m-292-640?quantity=1

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