M/C 470 Voltage Question

a1nowell

Chief Petty Officer
Joined
May 12, 2009
Messages
437
I have a M/C 470 with a 2 year old Breezework altenator conversion. My dash volt meter reads 13 and sometimes a little less volts, always 12.75 - 13 volts or a little more. I tested my altenator straight off the hot terminal on the altenator (3 wire) with a digital volt meter and was getting a consistant 14.5 to 14.65 volts. Is this good or is it too high? Also 8.5 volts from the + terminal on the coil.

Thanks,

Larry
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,088
Re: M/C 470 Voltage Question

I have a M/C 470 with a 2 year old Breezework altenator conversion. My dash volt meter reads 13 and sometimes a little less volts, always 12.75 - 13 volts or a little more. I tested my altenator straight off the hot terminal on the altenator (3 wire) with a digital volt meter and was getting a consistant 14.5 to 14.65 volts. Is this good or is it too high? Also 8.5 volts from the + terminal on the coil.

Thanks,

Larry

Ayuh,.... Have ya had a dead battery in the last couple years,..??

Are ya boilin' the batteries, Dry,..??

What was yer question again,..??

Sounds like the gauge might be off atad,...
 

stonyloam

Vice Admiral
Joined
Mar 13, 2009
Messages
5,827
Re: M/C 470 Voltage Question

Try reading the voltage directly off the terminals of the meter, compare to the meter reading. 14+ volts is what you should see when running. The fully charged battery (engine off) should read 12.6 volts.
 

a1nowell

Chief Petty Officer
Joined
May 12, 2009
Messages
437
Re: M/C 470 Voltage Question

Bond-o,
The reason I did the digital meter test was to determine whether my alternator was going bad or my guage is off. The digital meter reads 14.5-14.65 volts straight off the back of the alternator.
Conclusion:
Dash guage is not correct or voltages is lost on the way to the guage.
Question:
Is 14.5-14.65 volts tooo much voltage?

Larry
 

fmalott

Chief Petty Officer
Joined
Jun 28, 2010
Messages
561
Re: M/C 470 Voltage Question

Bond-o,
The reason I did the digital meter test was to determine whether my alternator was going bad or my guage is off. The digital meter reads 14.5-14.65 volts straight off the back of the alternator.
Conclusion:
Dash guage is not correct or voltages is lost on the way to the guage.
Question:
Is 14.5-14.65 volts tooo much voltage?

Larry

your alternator is fine your gauge is the problem my boat is a 1983 i just replaced the fuel gauge because it stopped workin i know my voltage gauge isn't working i did the same test as you straight off the alternator 14.5 gauge shows 12 volts so your fine with the 14.5-14.65 so Bond-o and stonyloam are correct
 

generator12

Senior Chief Petty Officer
Joined
Jul 9, 2010
Messages
666
Re: M/C 470 Voltage Question

+ 1. My gauge reads 13.5 for an actual 14.3. Just checked it today.
 
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