VR time for change?

[Ped]

15.2 volts do not sound alarming and probably won't hurt the electrical 
system. It's worth keeping an eye on though. I had the overcharge 
problem many years ago but it was more severe - over 18 volts. It killed 
two batteries with two years apart - and both times in Italy of all 
places. It wasn't until I got home after the second battery replacement 
that I thought of measuring the charging voltage, because everything 
worked the way it should. No blown light bulbs or anything. Without 
asking for any advice first I thought 'it's the voltage regulator' and 
got one off ebay. But after replacement the charging voltage was still 
over 18 volts. So I thought 'okay, its gotta be the generator, better 
get another one then' and got one from a wrecked motorcycle, also from 
ebay. Can you imagine my frustration when the charging voltage was still 
over 18 volts? Two generators with the same failure, not to mention the 
new voltage regulator that I had replaced in the first generator? I then 
(finally) turned to a Danish motorcycle forum for advice and got this 
answer: There are three wires from the generator and one of them (the 
brown wire) measures the voltage in the wiring harness. If the voltage 
is low for whatever reason the generator increases its output to 
compensate. You can check the operation of the voltage regulator by 
cutting the brown wire, fit an extension wire to it and connect it to 
the plus pole of the battery. Now run the engine and measure the 
charging voltage. If it has dropped to 14.2 - 14.8 volts the voltage 
regulator is okay and the electrical fault is elsewhere in the system. I 
failed to locate the fault, so my 'temporary fix' is now more than 10 
years old: The brown wire from the generator is permanently connected to 
the battery plus pole via a standard automobile relay which is 'on' 
whenever the ignition key is turned to 'on'. This has worked for me - 
might work for you too ;)

Ped
'96 "Black Stealth" GPZ
Denmark


Den 07-11-2015 kl. 15:53 skrev William K Denton:
> So I did a routine check of my charging system the other day after a ride on the fast black '96. My voltage at the battery read 15.2V @ 4K rpm, vs a spec of 14.2-14.8V according to the OEM shop manual. That's 5% over the midrange of the spec, so I'm wondering about the condition of the VR. Any thoughts?
>
> TIA,
> Bill in Yardley, PA
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