Today I noticed an odd "fast flash" in the turnsignals on my '01 SV650S.
It happened under engine braking while slowing on a freeway exit. At the
end of the ramp, the lights returned to normal cadence. A few minutes
later I checked again at a gas station, when the revs went over about 5K
the signals roughly doubled in flash rate and returned to normal when
engine speed dropped below that. Left and right seemed the same, but I
didn't check very systematically. No dead bulbs, and they appeared to be about the right brightness.
Alas, I didn't have a voltmeter with me.
A few minutes later (at home) I put a voltmeter on the bike and got a little over 14 V, which seemed good, at idle. Turned on the flashers, worked as usual. Voltage dropped a little, also as usual. Revved the engine, voltage dropped very slightly, also normal. No fast flash.
Anybody ever seen this? Google (actually, duckduckgo) turned up a flood
of hits, but practically all implicate dead bulbs or bad wiring, neither
of which is evident.
Thanks for reading, and any ideas!
bob prohaska
bob prohaska <bp@www.zefox.net> wrote:
Today I noticed an odd "fast flash" in the turnsignals on my '01 SV650S.
It happened under engine braking while slowing on a freeway exit. At the
end of the ramp, the lights returned to normal cadence. A few minutes
later I checked again at a gas station, when the revs went over about 5K
the signals roughly doubled in flash rate and returned to normal when
engine speed dropped below that. Left and right seemed the same, but I
didn't check very systematically. No dead bulbs, and they appeared to be
about the right brightness.
Alas, I didn't have a voltmeter with me.
A few minutes later (at home) I put a voltmeter on the bike and got a little >> over 14 V, which seemed good, at idle. Turned on the flashers, worked as
usual. Voltage dropped a little, also as usual. Revved the engine, voltage >> dropped very slightly, also normal. No fast flash.
Anybody ever seen this? Google (actually, duckduckgo) turned up a flood
of hits, but practically all implicate dead bulbs or bad wiring, neither
of which is evident.
Thanks for reading, and any ideas!
bob prohaska
I assume everything is stock.
So you were able to reproduce the problem while you were stopped at
the gas station, but not once you got home and put the meter on it?
Typical shyness effect...
I guess I would be looking to see if the problem can be reproduced
again. If you can reliably produce the symptoms only under certain conditions, then try to measure the battery voltage (or voltage at
the flasher relay) under those conditions.
The essence of my question is whether charging voltage can cause "fast flash" problems. Could be either high or low, but prime suspect is high. At the times I've measured it, the charging voltage seems to begin around 13.5
right after starting and gradually climbs to about 14.2 or .3 . At first glance those seem like good numbers.
So, I'm probably not being a lot of help here, but if it was my bike,
I would primarily be interested in knowing if my voltage regulator
was overcharging the battery. Replacing the flasher relay might stop
the fast flashing symptom, but would obviously not affect charging
voltage, which is a more concerning possible problem.
I may have to tape a DVM to the gas tank for a while.
bob prohaska <bp@www.zefox.net> wrote:
I may have to tape a DVM to the gas tank for a while.
That reminds me...
Hooking up a normal "fast" DVM gives you a reading that
is changing too fast to make a useful estimate of the average.
But the average current draw is OK for the bike's wimpy alternator if
you have the jacket liner and gloves powered at some fraction of their
total draw, which is accomplished by keeping the duty cycle under some
max safe value (75-80%?). My solution was to take continuous samples
and stuff the reading into a circular buffer, then take the average
of all the readings and display that. This works well to give a true
average (or at least a good enough proxy) for the battery voltage
over time.
I did my design using the Arduino LCD screen, but never got around to packaging the whole thing. Like a lot of projects, once I demonstrated
the concept I lost interest in bringing it all the way to a real implementation. In other words it's more fun to ride than play with
the soldering iron.
bob prohaska <bp@www.zefox.net> wrote:
I designed an Arduino based time-averaging voltmeter to monitor battery voltage on the KLR650 when using my electrically heated gear. The
problem is that the KLR has a barely adequate charging system at the
best of times, and the period of the PWM heat controller is about 1
Hz. When the controller turns the output on, the battery voltage is
lower than what is needed to charge the battery, because the alternator
can't supply enough current to power the bike and the heated gear 100%
of the time. Hooking up a normal "fast" DVM gives you a reading that
is changing too fast to make a useful estimate of the average.
But the average current draw is OK for the bike's wimpy alternator if
you have the jacket liner and gloves powered at some fraction of their
total draw, which is accomplished by keeping the duty cycle under some
max safe value (75-80%?). My solution was to take continuous samples
and stuff the reading into a circular buffer, then take the average
of all the readings and display that. This works well to give a true
average (or at least a good enough proxy) for the battery voltage
over time.
I did my design using the Arduino LCD screen, but never got around to packaging the whole thing. Like a lot of projects, once I demonstrated
the concept I lost interest in bringing it all the way to a real implementation. In other words it's more fun to ride than play with
the soldering iron.
On Wednesday, May 23, 2018 at 9:25:10 AM UTC-7, Mark Olson wrote:
bob prohaska <bp@www.zefox.net> wrote:
I heard there's some kind of non-digital technology called "analog" ? Something involving a moving needle I think.
https://i.imgur.com/EtqGLoN.jpg
I suppose I could have strapped my good old Radio Shack multimeter
on the bike.
https://i.imgur.com/EtqGLoN.jpg
As it happens I may have found a usable LED bargraph voltmeter: https://www.autozone.com/test-scan-and-specialty-tools/alternator-and-battery-tester/oem-battery-tester/544731_0_0
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