Wish I could offer quality technical advice, but the two parts that make me cringe is "brother in law" and "worked on it". 
Someone with expertise hopefully will be able to talk you through it here soon.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD
1979 Marine Trader 44, twin Ford Lehman 120s
2006 Panga 14, Tohatsu 20
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