I have a 2007 DF175 on my 22' Proline. I purchased the boat used and it has two batteries and a Perko battery switch. I purchased a Blue Sea add a battery kit and want to confirm my wiring. On the Perko switch, I had three wires connected to the common pole. The starter cable, house load, and a white wire. When I wired the new four pole switch, I connected the white and starter wire to the starter battery side and the house load to the house battery side. I have added some pictures in case I am not explaining correctly.
Old switch
Old battery switch by Herb Michelli, on Flickr
New switch
Battery switch by Herb Michelli, on Flickr
Thanks
Old switch
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New switch
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Thanks
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