I have a Scotty Black Box Positive Voltage Controller for your downrigger. I have the black box and one connector sleeve but you can add a second connector sleeve to this one. Seems to work fine.

Sell for $75 or trade for salmon fishing rods or reels: Downrigger rods or spinning rod/reels for river fishing. What do you have?

Steve

(I am in Kirkland)
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There's a fine line between fishing and just standing on the shore like an idiot. ~Steven Wright