Question about Stairmaster 3400CE Upright Exercise Bike

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Display won't light up when i start peddling, could it be the battery

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It most definitely could be the battery. I would start with checking for at least 6 volts DC output from your battery.
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Posted on Jun 20, 2014

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This may seem like a silly solution but it's worth a try if it gets you out of this jam. I believe the Kia has a safety feature where it won't let you shift the car out of park unless the break peddle is fully depressed. Try stomping on the break peddle while you start the car. Then see if it will let you shift out of park. If this doesn't work try pumping the break peddle a few times and try it again. If this doesn't work check the fuse box. Maybe the fuse for the actuator in the gear shift lever that lets you take it out of park is burnt out. I hope this helps you out.

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Brake lights

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Should the lights remain ON after you lift the brake peddle up, unplug one of the wires to the brake peddle switch. At this point, the brake lights should be off. This basically will determine whether your switch is shorted or is just a peddle pressing down on the switch due to a bad spring.

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