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Old 30 August 2009, 14:24   #1
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Can I charge a battery

I have just acquired a Yamaha 25 Two stroke outboard and wonder if this is capable of charging a battery.
The number on the plate is 25VM 61R L 300979

I don`t know what year it is and short of involving a main dealer I appeal to you all for some help.
If this is possible where can I purchase a compatible cable?
Please find attached a pic of what I think is an electrical inlet connection.

Hope someone can help.
Regards,
Wineprovider
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Old 30 August 2009, 15:52   #2
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just measure the volts. it'll either be 13-14v DC (good for charging) or 10-15v AC (not good for charging, intended for running a light).

If its the 2nd, you can easily fit a rectifier (and poss regulator) to make a charging circuit if you wish.

sorry, no idea about the connector.
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Old 30 August 2009, 15:55   #3
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Possibly the easiest was will be to stick a multimeter on the connections inside that cap. You want to know if it is a.c. or d.c. and what voltage it kicks out (and how high it goes at high revs). Once you know that do a search here and you should find similar questions not that long ago...

Your model number didn't make any sense to me... either that just means its before my time or perhaps you wrote it down wrong? or only part of it? I would expect something like 25MLHR - for a 25 HP 2 stroke, manual start, tiller steer, long shaft, built in 1993.
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Old 01 September 2009, 11:11   #4
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Engine plate

Thank you Daniel and Polwort for your replies. I am not electrically minded when it comes to the tester you suggested but hopefully I will be able to find someone who is.
I have attached a pic of the engine number so you can see (roughly) that the number I posted was correct.
Do you know where I can appeal for the type of engine I have?
Where would I fit a rectifier. It has been suggested on CD workshop manual that a Motorcycle one is ideal?
Thanks again,
Wineprovider
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Old 02 September 2009, 06:26   #5
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More info

Ok...................I have some more information and it looks like I need a rectifier.
I have sourced one and now need to know how to wire it in. The wires available are Red,Black,White and yellow.
Can someone tell me what these are connected to? There are two green wires coming from under the flywheel to the plug on the outside of the engine as published earlier but I cannot see a rectifier interrupting the leads.
Please HELP !!!!!!!!!!!!
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Old 02 September 2009, 07:08   #6
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I've got some pics somewhere of how my rectifier is wired up on my Yam 115. I'll dig them out if they are of any use to you.
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Old 02 September 2009, 08:04   #7
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are the two green wires attached to anything... the connector you showed us?

Yam rectifiers are two yellow inputs usually. i can be 99% sure one yellow and one white is the same thing - does not matter which way around, sounds like connect to the green's.

Black = -ve = usually connected to the engine metal "chassis" somehow
red = +12v

does that help enough?
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Old 02 September 2009, 12:05   #8
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Brilliant

What a splendid forum and contributions from you all.

The 2 green wires go into the plug I displayed and after hours of trolling Ebay etc. I`ve found the male plug that goes into what I already have. Here is the link which may help you understand what I was on about allthough I won`t be buying one at the price..........http://cgi.ebay.co.uk/Index-Marine-C...d=p3286.c0.m14

With my own research and your help I think I`m ready to fit.
Pictures would be a great help just to confirm my knowledge of the task.
Thanks again everyone.
Kind regards, fit in
Fisherwineman
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