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Discussion Starter · #1 ·
The 7-pin plug for a camper works as it should. I'm also wanting to have the option of getting 12v out of the 4 pin (using 2) for a water pump and macerator. The tester shows nothing...what am I missing?
 

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You are missing nothing, power is not provided on the four pin.

The seven-way provids power but it is limited and not suitable for running motors, that power should be coming from the RV's battery.
 
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