Fixing DEAD RandMcnaLLy

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My GPS sometimes just show me dead screen,or just turned off,and I just unplug power cord and it keep working.Today his completely show me gray screen and do...

Randmcnally, garmin, gps, how to fix gps, truck gps, truck, owner operator, change the battery, replace the battery, tnd 530, tnd 730, tnd 520, tnd 720 randmcnally 540 740
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