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I've seen where the brake air line pressure is actually spining a small impeller that's inside of the ETD to generate the electrical power to run the electronics, and, place a small trickle charge onto the ETD's internal battery. I'm guessing when the brake line doesn't have air pressure, the internal battery takes over to keep the ETD operative, until the brake air pressure is up again to get the impeller spinning to run the generator again. I believe I had seen this is an advertisement once for an ETD. <br /> <br />I mail ordered an ETD COD by UPS and tried to pay with an IOU and got in trouble with the FBI. [:D] Is an ETD the same as an EOT??
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