Blackmax is overcharging - Stator?

[Zaairman]

Hey guys, I have a 1983 Mercury 200 Blackmax and it is overcharging. Last summer I replaced the rectifier, that lasted about 2 minutes before I am guessing it popped and then voltage went up to 16-17 volts at speed. At idle-1500 RPM, voltage is normal, around 13-14. I am thinking it is the stator but am not sure. The stator is maybe 5 years old, CDI I think with very low hours (under 10). Boat runs great, but I cannot think of any other reason why it would be over charging other than a bad stator and the rectifer cannot handle the load. Thoughts?

[Go Time]

Sounds like you need the voltage regulator that connects to the rectifier.

[Zaairman]

Sounds like you need the voltage regulator that connects to the rectifier.

Hi Go Time,

Thank you for the reply. Unfortunately, a 1983 200 HP doesn't have a voltage regulator, it only has a rectifier.

[Go Time]

Regulators (part 88825A7) didn't show up until later models 1986 or so.....it will work.

[1BadAction]

CDI 16 amp stators have internal regulators. Rectifiers don't control voltage, they only "convert" the voltage to DC. 16-17 volts on a normal sized marine battery is not a big deal. I'd start to worry if it was running 18+ at speed, but being a 16 amp that's unlikely even if the regulator chit the bed. Most guys who swap from the 9 amp run 16s with no regulator at all.

[mn808gade]

what type batt??-th

[CKMATE225]

Beside making sure you have the right battery, Check all your connection, that may be your issue frying rectifiers. My old 2.4 225 would run just under 18 v at WOT. I never had an issue.

[Zaairman]

The batteries are Interstate Deep Cycle, standard wet cell battery. They are 1 year old. All connections are good and tight.

I think I've discovered my problem... I am 95% sure I have a 16 amp stator on the motor and it is frying the rectifiers. I will be confirming tonight. CDI said if I install their regulated rectifier (193-5081 since I have a tach) it will solve the issue if this is the case as it is popping the 9a rectifier.