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Reply to "PS-3 F-Unit Couplers"

The PS3 diesel boards need a load on both couplers to prevent the FET on the board from failing.  If only one coupler is connected, it may work for a while, until the FET fails.  That is why newer F units that have protocouplers on both ends  include a resistor load for when a dummy coupler is substituted for close coupling.  This is not a problem with the stacker boards.

Last edited by Jon G

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