Evinrude/Johnson charging

[JasB]

I have a 6hp evinrude/Johnson mix (handy with my hands) which has a charging socket on the side. Apart from the cable and male socket, what is required to charge my battery from this? Is it a direct connection, or is it via some sort of relay?

 

[Lakesailor]

As far as I know there is an on-board rectifier and the current from the socket is 12V DC.

Got a Multimeter?

 

[VicS]

You don't say what year or what the model number is for me to check out the details but AFAIK that is an AC lighting supply. (3 pin ? , 2 pin ? )

Assuming that is the case then a charging lead and rectifier is available as an accessory.

Some were fitted with rectifier but then had a battery connection lead rather than a socket. My 6 HP Yachtwin is like that but for the standard version this shows the battery charging accessory.

http://12.2.215.22/Scripts/ImgServ.exe/c...IF=G&ilRE=8

As sure as eggs are eggs someone will tell you that all you need is a rectifier from Maplin. Unfortunately although that may be true for somemodels with only a two wire output from the stator others with the three pin plug require a 3 phase rectifier.

Tell me the year or preferably the model number and I will look up more details for you.

If your have the knowledge then you could build yourself a 3 phase rectifier.

Lakesailor types faster but I don't think he is right. As he says you can check with a multimeter but if it is a 3 pin socket i am sure you will find it is AC


The rectifier if fitted is likely to look like part #43 in this diagram.

http://12.2.215.22/scripts/EmpartISAPI.d...EG=0&ilGM=0
And be bolted to the side of the block (three yellow wires and a red wire.

Tell us the year and or model number!

 

[Lakesailor]

Good point. If there is something that looks like this on the motor inside the cover, you have a regulator. (Or maybe with 4 wires)



If not contact these people http://www.mareng.co.uk/ who are incredibly helpful and will be able to provide what you need. All to the correct spec, but not at Johnson prices.

 

[VicS]

[ QUOTE ]
something that looks like this

[/ QUOTE ] That looks like a very modern type where they have gone back to a single phase design again!

Need the age or model number!

 

[JasB]

I'll get the details tomorrow, in the meantime....thanks

 

[VicS]

Model number should be on a plate on the transom bracket. Sometimes it's also on a core plug on the engine.

Explanation of the model numbers HERE

 

[William_H]

My old Johnson 6 (about 1985 model has 2 lighting coils and 3 wires out. If you follow the wiring from the inside of the socket you will see it goes straight under the flywheel to the coils.
I don't think the coils are 3 phase but are out of phase.

i connected up a bridge rectifier and battery with amp meter. Crude I know but I connected the rectifier to the wires that gave the most current. It gives about 1/3 amp at normal sort of revs. So not much.
I think the coils ended up in series.

The problem is that it is a lighting coil designed to give an AC voltage that won't blow the small globes of a nav light system. For battery charging you need a lot more voltage to get any real current into the battery.
I never got around to trying them but Schotky diodes in a bridge connection should give a little more current. In a bridge rectifier there are 2 diodes in series for each polarty of AC cycle so 1.4 volts aprox. is lost whereas schotky diodes should get this down to about .3v for each diode.
A bridge recifier is often drawn is a diagram as a diamond shape of 4 rectifiers. 2 anodes are connected together to give -ve output and 2 cathodes are connected together to give +ve output. One AC wire goes to a anode and cathode connected together and the other AC wire goes to the other anode and cathode connected together.

Since making up the rectifier lead I have not used the motor on the boat so haven't used it in anger but it would be useful for someone who uses a motor a lot. Certainly no regulator needed unless you are using the smallest of SLA batteries like about 5AH. olewill