Low Voltage Reading ???

Taz59

Petty Officer 1st Class
Joined
Apr 10, 2003
Messages
304
3.0LX Engine Serial Number OF554183

Engine starts and runs fine,but noticed when on the water and running 20-30mph the voltage drops down to 10-11 volts,when in idle the volts rise to 13volts is this normal

Cheers
 

Dshow

Petty Officer 1st Class
Joined
Jan 1, 2007
Messages
313
Re: Low Voltage Reading ???

I would check your alternator to see if it can handle a load. Most auto parts stores should be able to check it or there are loads you should be able to apply while in the boat to see if it can handle it.
 

Dshow

Petty Officer 1st Class
Joined
Jan 1, 2007
Messages
313
Re: Low Voltage Reading ???

There is a Mercruiser Service Bulletin on testing alternators... I don't have a link, but hopefully someone will post one?
 

mkast

Lieutenant Commander
Joined
Nov 6, 2002
Messages
1,934
Re: Low Voltage Reading ???

Use a multimeter to verify the voltmeter is accurate.
 

Don S

Honorary Moderator Emeritus
Joined
Aug 31, 2004
Messages
62,321
Re: Low Voltage Reading ???

Check your belt, very loose, worn belts will do that.
 
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