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Volvo Alternator
salmonhead 
 		  Port: Muskegon, South Haven   06/21/2005 07:21
King
Posts: 824
 

Frank,
I hope you can help me out on this one.
My batteries last year were getting low so I changed them for this season. I went with the Optima batteries. Group 24 for starting and 31 for the house. My volts on my meter are in the 12.2-12.6 range on the dash gauge and on my Lowrance x-15 they show the same for the most part. sometimes they dip to 11.8 or 11.9 then go back up to 12.4-12.6 most of the time while trolling. When up on plane running they are 12.8 or so most of the time.
I assumed the Alternator was going out so I bought a new one and replaced it last week. No change. Everything is the same. My local mechanic suggested the alternator is shot and I should be getting close to 14 volts while the motor is running. The Volvo parts dealer said nothing in regards to output other than it sounded like my alternator was shot.
I cant for the life of me remember if the gauge ever was close to 14 or not. Wonder if it has to do with the Optima batteries or if I am just hallucinating?
Any advice would be great.
Alternator is on a Volvo 7.4 GI 2000 motor
Vovlo Part # is 3860082
output 12V 65A GRD NEG
Vendor Part No. ACI 65622
SAE Marine J1171
Made by MANDO Korea

Hours about 1450 on motor. Original part before the change out

Now I have spent the $245 and gone through the hassel of changing it out and the results are the same as before????


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Re:Volvo Alternator
hondacat 
 		    06/21/2005 20:06
Moderator
Posts: 664
 

most dash gauges are off at least a half volt . we need much more info whats the voltage at the batery itself . what kind of batery isolator do you have separating the house batery from the main motor batery . what is the output voltage at the back of the alternator.
over half the time the alternator gets replaced because of loose or dirty conections , and belive it or not loose alternator belts . dirty batery cables
alternators in a boat usally last a long time
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Re:Volvo Alternator
salmonhead 
 		  Port: Muskegon, South Haven   06/21/2005 20:19
King
Posts: 824
 

thanks Frank. I will do what I can to test those items. The belt is a self titening variety serpentine belt. What type of gauge do I need to get to test the voltage at the other locations you mention. terminals all seem to be in good order.
Not sure of the isolator, where is that???

Thanks again
Paul


www.salmonheadcharters.com
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Re:Volvo Alternator
hondacat 
 		    06/21/2005 20:57
Moderator
Posts: 664
 

a decent digital volt ohm meter will get the job done. a batery isolator is inportant especially when diferent size batery are used . a single charging system will have truoble diferentiating one batery from the other over charge one and not charge the other with out a isolator the isolator should be between the engine charging system and the bateries
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