1990 Evinrude 120. Previous owner's service records indicate that he had a higher power charge coil added several years ago. While tracking down the source of a misfire, I checked the resistance of the stator and then the charge coil, which manual said should read 450 +/- 10 ohms, it read infinite, as in open circuit. Wasn't shorted to ground. Now I'm wondering if that dead #2 battery I inherited with the motor was just not getting charged. Voltage at about 1500 rpm is just 13, which, were this a car, is too low. Should I be seeing something like 13.6 volts, or at low speeds does the charging system not have that much oomph, especially when it's hooked to a low battery?