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2008 Shadow aero 750, replaced battery(selonoid clicking; no

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start), then started fine. Left...
2008 Shadow aero 750, replaced battery(selonoid clicking; no start), then started fine. Left overnight, battery drained....
Thanks, Henry;***@******.***
Submitted: 2 years ago.Category: Motorcycle
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Answered in 2 hours by:
5/28/2015
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
Wayne S.
Wayne S., Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 1,255
Experience: Experienced and Licensed Motorcycle Mechanic - all sizes and brands welcome.
Verified

Welcome,


It may not be a quick fix as it sounds like you have
something draining the battery. Could be short
circuit somewhere.
I suggest disconnecting the negative battery cable
from the battery and then put a test light
or multimeter between the negative post
on the battery and the negative battery cable.
If the light comes on strong you have a definite
drain in the wiring circuits.
This assumes the battery has been recharged.
Also do all these tests with the ignition key off.
Start pulling fuses or disconnecting various
connectors until the light goes out.
That will be the circuit or device that is
causing the battery draining.
Then it is a matter of finding the exact point
in the circuit that the drain is at or the
exact device that is causing it.
You should be able to narrow the drain down this
way and either repair or replace the problem.
I will be back around 4pm today if you need further help.
Thanks
------
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Customer reply replied 2 years ago
Thanks, ***** ***** try this. How would you know if it is the voltage regulator?
-HW
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
Hi,
If the light goes out when you unplug the regulator
then it might have a short in the regulator.
That is also done as above with the key off.
If you get no light between the negative battery
post and the negative battery cable end then
there is no drain happening.
Let me know what you find.
----
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Customer reply replied 2 years ago
Well I was using a meter on DC volts (neg Bat. terminal to neg cable) and unplugging the regulator did not make much of a difference. Going through the fuses I found a reading of nearly 13 volt drain until I pulled the odometer fuse and then it dropped to about 1/2 volt drain. Pulled off the odometer/ speedo console and unplugged it to see if it was wiring but after putting the fuse back in the drain remained 1/2 volt (with console unplugged) so I believe there must be a short in the odometer (console also has temp and oil light all on that one plug). Think that's it? Thanks, -HW
Customer reply replied 2 years ago
I charged it up, took it out and after shuting it down for about 20 mins, it was completely dead again, I think it may be the new lithium battery I just put in a day or two ago. What do you think of those?
HW
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
It is possible the battery is faulty. I would get that
load tested if possible before replacing any other parts.
A 13 volt drain would certainly be hard on the battery too.
If the battery can be checked at an auto or motorcycle shop
do that or return it and try another one.
Once that is for sure okay then we can keep testing.
----
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Customer reply replied 2 years ago
Exchanged the battery for a lead 200 cca. Why would the drain be from odometer. Points to ignition switch maybe?
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
Is your bike charging 14 volts at a fast idle?
Wondering if that is a problem or not.
I think your battery drain is operating with the ignition switch off
so I am leaning away from that switch as a problem.
The odometer circuit is live from the red battery wire
through the fuse and on to a pink wire that goes up
to the instrument or meter console. This wire
is live all the time but should not be a large drain
on the battery.
I may have forgot to mention the drain is done by measuring amps
not volts. The odometer may read 13 volts but may be drawing
very little current from the battery.
In your case though it seems like the battery went dead fast
so check the charging output and then back to the odometer
if that circuit is the only one draining.
Keep an eye out for warm wires anywhere.
----
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Customer reply replied 2 years ago
I just had the front tire changed a before all this happened. Do you think it may have something to do with the speed sensor on the front wheel?
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
Might be possible if something was pinched or whatever.
The speed sensor does go to the meters.
Have a look in that area or unplug the sensor for a test.
The sensor has one wire to the meters, black/yellow.
The green/black is ground and the brown is a live
wire when the ignition switch is on but should
be off when the key is off.
I suppose the odometer or meters could be shorted
to the sensor somehow but only the meters
pink wire is live with the ignition off.
The short would have to be from the pink to
the black/yellow sensor wire. If you disconnect the
sensor plug then the drain should stop if the
sensor is shorted in the meter/odometer.
--
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Customer reply replied 2 years ago
Well, she runs great as long as the speedo is disconnected. Did you find out why the speedo is always hot? or the pick-up on the frt wheel?
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
I am a bit confused here, are you saying your
speedo sensor is on the front wheel?
It should be on the left side of the engine.
Let me know so we can be sure we are talking
about the right parts here.
-----
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Customer reply replied 2 years ago
There is a coil on the sensor and in the speedo?
Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
Yes the speed sensor is screwed into the
left side of the engine under the
rear side cover.
Looks like this:
http://i.ebayimg.com/00/s/NDgwWDY0MA==/z/0AQAAMXQNo5TX-3v/
Yes the speed sensor is screwed into the
left side of the engine under the
rear side cover.
Looks like this:
http://i.ebayimg.com/00/s/NDgwWDY0MA==/z/0AQAAMXQNo5TX-3v/$_35.JPG
---35.JPG
---
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Motorcycle Mechanic: Wayne S., Motorcycle Mechanic replied 2 years ago
Might help
Copy/paste in browser:
http://members.shaw.ca/wsamel/VT750%20Speed%20Sensor
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Wayne S.
Wayne S.
Wayne S., Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 1,255
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Experience: Experienced and Licensed Motorcycle Mechanic - all sizes and brands welcome.

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