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1981 mercury 25hp not firing

LowellD1

New member
My 1981 mercury 25 will not fire during high humidity mornings. I live in SW GAand the humidity is always high. I hauled my boat to the lake in a heavy fog and it would not fire at all no matter what I tried. Later in the day when it was in the sun for a few hrs, it cranked up immediately. Any hints on what to look for will be greatly appreciated!
 
Might be plug wires are leaking voltage to ground, try running at night to observe leakage; dirty plug(s) ceramic(s) could also be issue.
 
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