1969 85hp Evinrude charging system/ Over charging!

[68glasspar]

!969 85hp Starflite/ model 85993. I was out briefly on the water and volt meter indicted 13.5 to 14volts but the jumped to 16.5+volts. Idled back to the pier and out of the water.
I had previously replaced the rectifier with a nos part due to the wire insulation falling off.
What actually controls the voltage output on this motor? I don't see anything labeled as a voltage regulator in the wiring diagram.
Also whats the best spark plug for this motor? service manual says L-19V champion

 

[cyclops222]

Some motors DO NOT have any charging voltage regulator. The battery keeps getting higher any time the motor is above a very fast idle. My Evinrude. I put in a simple switch to open the POSITIVE output lead of the rectifier. I am a very good electrical person.

 

[68glasspar]

Why in the heck would Evinrude design it like that? Especially when they must of know a high voltage like that isn't good for the CDI box.
I have parts from a 1970 85hp, model 85093D and that has a voltage regulator on it

 

[68glasspar]

I think the regulator on my 1970 parts is the p/n 173640 regulator that was released to add a regulator to these engines.

 

[Mc Tool]

You can buy a reg/ rect that will work on your motor for 20 bucks (NZ) off Temu .....not that you need one . But I think the reason your volt meter went high maybe there is no load on that circuit ....like it just stopped charging . Are all your electrical connections in good order ?

 

[68glasspar]

You can buy a reg/ rect that will work on your motor for 20 bucks (NZ) off Temu .....not that you need one . But I think the reason your volt meter went high maybe there is no load on that circuit ....like it just stopped charging . Are all your electrical connections in good order ?

Thanks for the suggestions and i will double check my connections. the only load on the system is recharging the battery and a volt meter, unless i turn on the nav. lights.

 

[cyclops222]

Just REMBER !!!!! You have to remember the very high battery volts like 20 or higher WILL BURN OUT BULBS Been there. Can damage electronic things like fish finders. Been there 2 times.
Most units sold are ////// only rectifiers ////// Lying makes more money.

 

[68glasspar]

Just REMBER !!!!! You have to remember the very high battery volts like 20 or higher WILL BURN OUT BULBS Been there. Can damage electronic things like fish finders. Been there 2 times.
Most units sold are ////// only rectifiers ////// Lying makes more money.

I am well aware of what high voltages due to electronics, thats one reason for my astonishment of why they were designed without out a voltage regulator.
I have read other threads on this site and others about a voltage regulator marketed by BRP in the past. I attached a picture that i believe is that regulator on some parts from a 1970 85hp. My understanding is that it is used in conjunction with the existing rectifier. Also it looks like CDI electronics offer a rectifier/regulator for this engine also.
I would never put a cheap Chinese part on my Evinrude!

 

[dingbat]

Your rectifier, battery cable, battery or possibly the stator have issues

Have you checked for AC upstream of the rectifier or run ohm test to determine the condition of the stator?

You said you replaced the rectifier. Quite often a failed rectifier will overheat and compromise the stator.

Back when your motor was built, not much in the way of electronics were involved. The battery had enough “sink” capability to average out the voltage enough to run the motor and a couple of incandescent lamps. It wasn’t until much later that “electronics” on a boat became a thing

 

[68glasspar]

Your rectifier, battery cable, battery or possibly the stator have issues

Have you checked for AC upstream of the rectifier or run ohm test to determine the condition of the stator? Quite often a failed rectifier will overheat and compromise the stator.

Back when your motor was built, not much in the way of electronics were involved. The battery had enough “sink” capability to average out the voltage enough to run the motor and a couple of incandescent lamps. It wasn’t until much later that “electronics” on a boat became the norm.

The rectifier was replaced recently with a nos part because of crumbling insulation on the original. I have a new group 27 battery in the boat. I have not done a resistance test on the stator yet. I added the volt meter this year because i was concerned about not knowing the charge state of the battery.

 

[racerone]

That little rectangular box is the " clipper " unit.

 

[68glasspar]

That little rectangular box is the " clipper " unit.

Thanks! I was hoping that was the p/n 173640 voltage regulator.
Any problem with installing the 173640 regulator or the CDI 193-3408 regulator?

 

[cyclops222]

Check ...WHERE ...you will have a Aluminum space that is FLAT ENOUGH to mount the Clipper to. You CAN NOT just drill holes anywhere you want to !!!! You may drill into water or air tubes. Not a good thing to do.

 

[68glasspar]

That little rectangular box is the " clipper " unit.

Does that clipper regulate the voltage?

 

[racerone]

It is not called a voltage regulator.----Your factory manual would explain what it's function is.

 

[68glasspar]

It is not called a voltage regulator.----Your factory manual would explain what it's function is.

it not shown in my 1969 manual, the part is off a 1970 85hp but also not shown in the 1970 wiring diagrams

 

[dingbat]

Any problem with installing the 173640 regulator or the CDI 193-3408 regulator?

The rectifier (diode bridge) converts the AC output of the stator to a (mostly) DC voltage.

The regulator simply takes the rectified output, now DC voltage, and regulates the output typically between 13.5 and 14.2 volts.

The "excess" voltage is dissipated by the regulator as heat. Proper heat sinking of the regulator is critical for the unit's long term survival. You could use just about any voltage regulator you want as long as its capable of handling the rated output (amps) of the circuit.