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Old 30 December 2014, 10:51   #1
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Outboard voltage

Hi Can any one help me with this

Outboard is

Ex rnli mariner 2 stroke 40hp

I have noticed on the newly installed volt meter that the voltage is going up with rpm to 16 volts!
I assume it's the same as a car and should Limit to 13.8v

Am I right in thinking the rectifier is knackered ?

I have just put in another one 2nd hand from eBay and that is exactly the same


Any help much appreciated

Thanks Stuart
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Old 30 December 2014, 11:07   #2
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Outboard voltage

Just found this on the net


"I've just fitted an identical one to my Mariner 15. This engine has a stator (like the al;ternator on a car) under the flywheel which puts out alternating current (AC) and if you want to charge a battery you need to convert it to Direct Current (DC) That is what the rectifier is for - you now should have DC power flowing out of the rectifier with the red lead being positive to the battery + terminal and returning from the negative terminal through the engine casing to earth (ground). You should check this with a voltmeter between the red cable and the engine case and you will find an output voltage of between 10 V at idle to about 18V at full revs - you may need to fit a voltage regulator to limit this top voltage to 14 V or 15V so as not to damage 12V instrumentation run off the battery such as VHF radiio, fishfinder etc."



I am now thinking it is only a rectifier with no regulator!
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Old 30 December 2014, 13:41   #3
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take a pic of the rectifier unit and post it-I should be able to tell you what you've got.
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Old 30 December 2014, 13:54   #4
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I have protected each piece of electronics with a 7812 voltage regulator (about 50p each) but there is a thread on here somewhere about using a motorbike regulator...
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Old 30 December 2014, 14:16   #5
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Quote:
Originally Posted by Nos4r2 View Post
take a pic of the rectifier unit and post it-I should be able to tell you what you've got.

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These seem quite common on older outboards Stanley de4204

I cannot find any spec for this on the net I think now it is only a rectifier

Thanks
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Old 30 December 2014, 14:20   #6
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I have protected each piece of electronics with a 7812 voltage regulator (about 50p each) but there is a thread on here somewhere about using a motorbike regulator...

Hi thanks just looked on eBay biggest was only rated at 1.5 amp

What did you use on your radio?
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Old 30 December 2014, 14:40   #7
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There are a couple of other versions. I used a 78S12 which is 2A, but I should probably have gone for the 78T12 (3A).

They do get quite warm at times; a nice bit of metal nearby was a convenient heatsink... ...don't blame me if they burst into flames.
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Old 30 December 2014, 14:56   #8
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There are a couple of other versions. I used a 78S12 which is 2A, but I should probably have gone for the 78T12 (3A).



They do get quite warm at times; a nice bit of metal nearby was a convenient heatsink... ...don't blame me if they burst into flames.

Thanks
Out of interest if you are still running your mariner 30 do you know what voltage it was kicking out to the battery ?
The rectifiers I have are the part used on the older mariner 30's
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Old 30 December 2014, 17:14   #9
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I put a motorcycle regulator/rectifier into my outboard to control voltage. It is not really important on brand as they will function if it is compatible with the boats current electric system. In other words it could be from a PWC, snowmobile, motorcycle, garden tractor, etc. Rectifier alone will smoke an AGM or gel battery very quickly, as the voltage goes too high.
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Old 31 December 2014, 01:18   #10
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I assume you have a battery installed? If not, that's your problem. Loading the output will pull the voltage down a substantial amount.

jky
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