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Reply to "PS-3 F-Unit Couplers"

First off, check the wiring to the coupler to make sure it's not broken or chaffed/pinched.  If either coupler lead has been grounded, it could have taken out the FET on the PS/3 board that drives the coupler.  Next, unplug the coupler and measure it's resistance, it should be between 2 and 3 ohms.

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