12.3-12.6 could well be the error factor of your meter. Especially if
it's installed. All my checks are done with a $400 fluke. Way way
over kill for automotive/bike applications. That said there is no
hard and fast rule of physics that says it has to be 12.4. I'm sure
different combinations of metals and acids will produce slightly
different results. It would seem you caught me out on a bit of a
generalization ;o)
The 15+v is your charging system replacing the energy used to start
the bike. .7 vs.9 again could be error factor or your regulator might
just like a little more juice. 13.2 is the fall off from 14+. The
battery can only maintain 12ish but when slightly overcharged
(theoretical not bad overcharging that signals a problem.) it'll lose
the extra slowly. This is one of the reasons to jump to a batt
instead of the starter or frame. The Batt acts as a regulator,
soaking up some of the extra push. Your charging system only puts out
full volts when it's making enough amps, that is NOT at idle for very
many things. Some 70's cars needed 1500 rpm or more, from what I've
read NH's have a bit of trouble in this area too. At idle you're
actually discharging. On your particular bike if your meter is
accurate you're ok. My 76 Civic was only 10.5v from the alt at 650rpm
idle. A long train with a worn out batt was a problem :o( . In stop
and go traffic I had to pull a little choke to bump the idle up, a
very bad method but it worked.
At 01:07 PM 11/18/2011, you wrote:
Recently, one of our more knowing posters on electrical systems said:
"12v wet cell battery from a Nighthawk ... will have no more than
12.4 volts at rest. A
running 12v vehicle will *normally* have 13.2v-14.7v."
The voltmeter I installed on my hi-miles NH shows anywhere from
12.3-12.6v parked, then on initial highway speed, first jumps to 15
or even 15.1v, after a minute dropping to 14.7 to 14.9 for the rest
of the ride. except when stopped at a light, when I see
13.2v. Everything seems to work ok, but are these readings a sign
of trouble to come? And if so, what components would be suspect? Thanks,
Jay S
03 NH750 (113M miles)
South Florida
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Pat Patterson
Abbotsford, BC, Canada
2001 PT Cruiser
83 450 Honda Nighthawk
78 F350 460/C6 on propane
71 Bronco 302/C4/D20 D44/9"
Some people try to turn back their odometers. Not me, I want people
to know "why" I look this way. I've traveled a long way and some of
the roads weren't paved.
"If you can't take the heat, don't tickle the dragon."
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