+5 is -5

cwales

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I think I read about this once long ago, but it's never come up for me before... And I cant think of a way to search for it ht works...

Anyhow, my pole position boards are fine in my upright cab at the store after rebuilding the power supplies, but in the cockpit a home the +5 is -5... What the heck causes that?
 
There are two power supplies, are they both sending good power to the boards? Are the edge connectors weak causing an intermittant signal?
 
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