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Author Topic:   Mercury 60-HP: Charging Current Output
albinman posted 01-04-2007 10:10 PM ET (US)   Profile for albinman   Send Email to albinman  
I have a 2004 Mercury 60-HP motor with an alternator. [How many] amperes would [the alternator] put out? Thanks Ray
jimh posted 01-05-2007 12:11 AM ET (US)     Profile for jimh  Send Email to jimh     
You are probably more interested in the net charging current available after the output of the alternator has supplied the engine with the current it needs rather than just the the actual alternator current output. This specification is given in your engine owner's manual.

We can't really help you with this inquiry because you haven't specified the motor. There are several different families of motors in the Mercury outboard line and they have different electrical specifications.

You'll get the most accurate information right from your owner's manual. If you don't have the owner's manual, they are well worth the cost of buying a replacement. The owner's manual has a lot of very valuable information in it.

Chuck Tribolet posted 01-05-2007 08:45 AM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
You can probably find a PDF of the owner's manual on Merc's
website. Have your serial number and model number in hand
as the manuals vary.


albinman posted 01-05-2007 03:19 PM ET (US)     Profile for albinman  Send Email to albinman     
I just talked to the rep at Mercury Marine, He said their advice is only connect the engine to the starting battery, have a seperate battery for the VHF, electronics etc. He would not tell me the AMP output after the motor received what it needed. I still feel there is enough extra juice for the VHF and depth sounder and still keep the battery charged. Agree? The motor is a 60hp 2004 model 2 stroke. Thanks Ray
Chuck Tribolet posted 01-05-2007 06:14 PM ET (US)     Profile for Chuck Tribolet  Send Email to Chuck Tribolet     
The VHF and fishfinder use almost no power (< 1A unless the
VHF is transmitting, then about 6A).


alfa posted 01-06-2007 02:55 AM ET (US)     Profile for alfa  Send Email to alfa     
Gross current is 16 Amp. Not sure that is the net charging current.


albinman posted 01-06-2007 07:08 PM ET (US)     Profile for albinman  Send Email to albinman     
Thanks for all the help, I have the owners manual, however, it does not have any information about electric output. The reason is they don't want any additional drain on the battery. Today I ran the boat about five hours with the VHF and Lowrance 68C on and the battery showed no signs of losing charge. That response from alfa saying the output was 16 amps made me feel very comfortable. Thanks Ray
sternorama posted 01-09-2007 03:55 PM ET (US)     Profile for sternorama  Send Email to sternorama     
no one mentioned RPM-doesn't this effect the output?
jimh posted 01-09-2007 11:36 PM ET (US)     Profile for jimh  Send Email to jimh     
A detailed description of the operation of a permanent magnet alternator is given in a separate article. The output of a permanent magnet alternator varies in proportion to the speed of the relative motion between the permanent magnet and the coil windings.


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