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Hi Everybody! First post to the forum, and I have been reading/visiting sites generally sopping up info like a dry sponge. I am just getting into g scale, have a test track set up, decided on battery powered running gear, have gotten a collection of engines and started some projects. I got a few engines, new and used, put together by my suppliers ( rld ) and have upgraded a couple Aristo dash-9 and usat sd40 to airwire. Living in Reno has gotten me down to the Sparks yards to trainspot a couple of times and I'm just absorbed... My question is about my upgrade of a USAT sd40 with a drop-in Airwire board. When I flip the motor switch I am getting a high frequency beep off the airwire speaker. I've read that this indicates the voltage controllers are over loading. IF I start running the engine the beep usually goes away. I am looking for someone who has run into this before or has confirmed what the issue is with CVP. I have tried unplugging either drive unit in turn to see if either one had a short, no difference. Also, the interior and cab top strobe are extremely dim, almost non-lit. I am looking for info as to what this might be related to and any fixes? Could this be related to the beep? I am using an 18.5V li-ion 9ah battery. I wanted to ask here before going to CVP, as, from what I have seen, their answer is always, send the board in for testing... Thanks for any help Robert