not starting after winter lay up

[ronsue42c@gmail.com]

New engine to me last year, ran fine, winterized with antifreeze. Been trying to start this spring for a couple weeks. Engine turning over, but just cranks. Water pump working as water out exhaust. Drained carb. & got clean gas. However, when I take boat cover off, I don't smell gas, like I did last year each time I used boat. New plugs & wires. Put multimeter on pos. & neg. of coil, turned key - showed about 4 volts & decreasing. Electronic ignition & coil are quite old. How do I check coil & distributor cap. Any other ideas?