Gmccracken_ca
Cadet
- Joined
- Mar 28, 2015
- Messages
- 11
I have a 1981 Mercury 25HP which usually starts and runs fine in summer temperatures (around room temperature) but when the temps drop to near or at freezing, it just won't start. I suspect spark problems because sometimes I can get it going by spraying WD40 on the plug wires. In freezing temps that won't even work. I leave the boat floating in the lake all summer with the motor tilted up with the prop out of the water. The engine is usually covered with a poly tarp. Ev en in warmer temps it can take 30-40 pulls to get it going. Later in the day after a run, it will start on one pull practically all the time. I am wondering which components are most affected by moisture and is there a way to determine which component is having the problem by measuring resistance and/or voltage. Does resistance of stator change if moisture is involved? I'm guessing if I had a DVA meter I would notice a voltage drop when moisture is impacting the components? Any recommendations? I presume when it is running well, testing of voltages or resistance will not reveal any problems.