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Old    John Keenan (keenan)      Join Date: Sep 2005       05-19-2007, 7:07 AM Reply   
I have an 01 X-Star and I can't figure out why the batteries are not charging fully? I removed the alternator and had it tested and it was fine.I checked the ground wire and it was on tight. I can't rember what the voltage should be running but i thought it was around 13.5-14.5. I am only at 12-13 with occasional dips to 10. When I throttle down the voltage starts to pick up slightly but still doesn't go past 13. Any help would be appriciated I am at a loss. I would take it to the dealer but it is 5 hours away and I don't want them to take all summer to get to it.
THANKS, John
Old    Big E. (wakesetter101)      Join Date: Oct 2005       05-19-2007, 7:19 AM Reply   
Are you testing it with a meter or just your gauge?
Old    John Keenan (keenan)      Join Date: Sep 2005       05-19-2007, 7:26 AM Reply   
I have a capacitor for the stereo with a digital readout that I was using but I have a multimeter
Old    rick ator (mkperceptions)      Join Date: Jan 2007       05-19-2007, 10:29 AM Reply   
Dont read the cap voltage. Read the voltage at the batteries and at the alternator.
Old    Rod McInnis (rodmcinnis)      Join Date: Sep 2002       05-21-2007, 1:10 PM Reply   
When you had the alternator tested, did they test it for voltage and amperage? How many amps did it produce?

Like the others said, get yourself a multi-meter and measure the voltage right at the battery, then measure the voltage right at the alternator.

If you have the engine running at fast idle and minimum load (stereo, pumps and blower off) then you should get at least 13.5 volts at the alternator and essentialy the same voltage at the battery.

If there is a significant difference in voltage between the alternator and the battery then there is a problem in the wiring.

If the alternator is not putting out at least 13.5 volts with an engine RPM of 1000 or so then the alternator is weak.

Rod
Old    Nate (norcalmalibu)      Join Date: Jun 2004       05-21-2007, 3:07 PM Reply   
Do you have a high output alt, sometimes when they wind them up for more output using a smaller case during idle it will be lower then 13.5 It wont achive 13.5 until it goes past idle.
Old    Kerry Parker (kerryn2skiing)      Join Date: Apr 2007       05-21-2007, 4:47 PM Reply   
Although you said that your ground wire was tight, check your cable ends for hidden corrosion. I can't stress enough how important good grounding is, especially on a boat.

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