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Old 02-22-2018, 09:02 AM   #8
aboatman
Senior Member
 
City: Washington
Join Date: Nov 2017
Posts: 468
A second (backup) switch for the bilge pump would be wired in parallel with the first switch. To put it in more simple terms, the two wires from the new switch connect to the same place as the wires from the first switch.

Test everything with water when you're finished to make sure you've done this correctly.
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