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post #1 of 8 Old 05-25-2008 Thread Starter
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Alternator output

I just checked the alternator output on my 7.5 hp evinrude yachtsman. I came up with 22 volts dc. Seems a little high too me. I was expecting around 15 vdc. Is this normal, should I add a voltage regulator, or am I having alternator issues.

I went to the evinrude site without luck. Any help would be appreciated.

Jim
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post #2 of 8 Old 05-25-2008
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Why did you check it?
Was something wrong?
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post #3 of 8 Old 05-25-2008
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It should be 16 to 18 volts. Doesn't it have a regulator already? I think it should.

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post #4 of 8 Old 05-25-2008 Thread Starter
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I checked it because I was curious to the output as I have never had an outboard with a charging system. I felt I should know what I was hooking to the battery. Also wanted to make sure it was worth hooking up.

I checked for a regulator and am uncertain if it has one. I traced the wiring to a junction block and from there to a small round object about the size of a quarter and 1/2 inch thick. Other than that, nothing.

I need to find a break down of the engine. That is the only way I can tell for certain what I have.

Jim

I believe what I found is a rectifier.

Last edited by vabuckeye; 05-25-2008 at 01:03 PM. Reason: Add information.
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post #5 of 8 Old 05-25-2008
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My bet is that it will charge just fine if it is dc volts.
Once a battery is installed it will read the voltage and adjust output.
Should be just two wires--red and black.
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post #6 of 8 Old 05-25-2008
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Don't worry. The small amperage your engine offer (in general from 4 - 8 Ampers/hour) is small enough to not damage your battery in shorts cruise, considering it will be at least 7-10 times the amperage output (60A - 80A). And yes, same as my BF100 1979 Honda, it shows above 20DC without a battery installed. Relax ...
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post #7 of 8 Old 05-26-2008
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Did you measure AT the battery terminals with the engine hooked up and running? That is the only way to do it.

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post #8 of 8 Old 05-26-2008 Thread Starter
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The battery was disconnected. I searched deeper into the evinrude/johnson forum and found the same thing you all have stated. The output will be off if the battery is disconnected and it is not good for the engine to run without a battery.

I'm off to hook it up and recheck.

Thanks for the time and have a good day.

Jim
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