Wild Dog Adventure Riding

Technical Section => Make / Model Specific Discussions => KTM LC4 400/610/640 & 690 => Topic started by: Amsterdam on February 18, 2020, 01:00:58 pm

Title: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Amsterdam on February 18, 2020, 01:00:58 pm
Every once run a while I get a call from my son - "Dad, my 690 is dead again".  This call can come from his house or when he is riding somewhere.  When you turn on the ignition not even the dashboard lights come on or they come on and go through that low voltage routine.   Just a few weeks ago this happened again and I put the working battery from my 701 in his bike.  After that all was fine again for a while.

Yesterday I picked him up in Newlands, same issue.  He was riding along, slowing down for a traffic light and the bike cut out.  It was too dead to even swing the motor over once.  The battery voltage was at about 11V.  After pushing the starter button you could hear the relay click and the voltage dropped to about 2V.  It then came back again to about 10V after a little while.  I took the bike home and put it on charge, and after a while it starts again as normal.

The voltage while the engine is running, measured on the battery terminals, is 14.5V.  I have had the bike here before and it has stood for a month or more, it starts just fine on the first push of the button.

So, what can it be that that causes this?  What should I be looking at, measuring, replacing?  As with many 690s, the seat pan is broken.  Can this cause the problem by possibly pushing down on some of those relays just behind the battery?
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Mpandla on February 18, 2020, 01:05:53 pm
Check all the cables underneath the battery for chafing.
Also clean and re-tighten the earth connections.

Could just be a loose earth or wire that is shorting out
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: onderbroek on February 18, 2020, 01:08:29 pm
How old is the battery?

Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Colin Kaapschehoop on February 18, 2020, 01:26:53 pm
Sounds like a battery at the end of its life,
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Operator on February 18, 2020, 01:30:29 pm
Sounds like a battery at the end of its life,

but swapping out with battery from 701 surely (99,999% certain) eliminates the possibility that the battery is toast
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Colin Kaapschehoop on February 18, 2020, 01:33:41 pm
They can both be toast
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Amsterdam on February 18, 2020, 01:42:03 pm
The battery in my 701 was not overly old and has worked flawless all along in the 701.  If the problem had just been not starting in the morning then I would have thought that maybe this battery is also finished.  But starting fine, riding along and completely dying after 15 kilometers?  I think it is something else that causes the battery to drain. But please keep the suggestions/experience coming.

I will strip and do some checking as Mpandla suggests.
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Black_Hawk on February 18, 2020, 02:08:16 pm
I see that you've mentioned that the seat pan is broken... have you tried testing the voltage while the bike is idling and somebody is sitting on the seat.

It might be that this is for some reason causing a short or something when there is weight on the seat and the battery is not charging.

I fitted a voltmeter to my bike after I had issues with a stator and voltage regulator at two different occasions. At least now I can monitor the voltage while riding.

It seems like the battery is not being charged while the bike is riding, then things like the fuel pump, lights and all electronics will drain the battery.
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Operator on February 18, 2020, 02:14:47 pm
Voltage regulator/rectifier that is (nearly) toast................or perhaps the contact points on it is corroded and
working intermittently..  I had a similar situation on a Tenere 660 a few years ago. 
 
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Amsterdam on February 18, 2020, 02:28:15 pm
I see that you've mentioned that the seat pan is broken... have you tried testing the voltage while the bike is idling and somebody is sitting on the seat.

It might be that this is for some reason causing a short or something when there is weight on the seat and the battery is not charging.

I fitted a voltmeter to my bike after I had issues with a stator and voltage regulator at two different occasions. At least now I can monitor the voltage while riding.

It seems like the battery is not being charged while the bike is riding, then things like the fuel pump, lights and all electronics will drain the battery.

Good idea.  If I can't find it easily I will fit a voltmeter and see what that shows over time.
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Black_Hawk on February 18, 2020, 02:30:39 pm
I see that you've mentioned that the seat pan is broken... have you tried testing the voltage while the bike is idling and somebody is sitting on the seat.

It might be that this is for some reason causing a short or something when there is weight on the seat and the battery is not charging.

I fitted a voltmeter to my bike after I had issues with a stator and voltage regulator at two different occasions. At least now I can monitor the voltage while riding.

It seems like the battery is not being charged while the bike is riding, then things like the fuel pump, lights and all electronics will drain the battery.

Good idea.  If I can't find it easily I will fit a voltmeter and see what that shows over time.

It might be a good idea to take a short ride around the block with a volt meter connected to see what the reading is while riding.
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: geopat on February 18, 2020, 08:42:02 pm
My old 640 did the same thing ended up being a rectifier perhaps intermittent problem there
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Amsterdam on February 19, 2020, 06:47:32 am
I have wondered the same thing.  Did all the wiring inspections yesterday, cleaned and tightened earth connections and sprayed contact cleaner in big plugs I came across.  Unfortunately didn't see anything that was an obvious issue.  And these intermittent problems are a bugger to find.  Will take it for a ride today and see if I can determine anything.  Will have a spare battery, some tools and a voltmeter in my backpack.

Thanks everyone for the suggestions so far.
Title: Re: Battery on 690 randomly draining while riding - Who has a good suggestion?
Post by: Black_Hawk on February 19, 2020, 09:27:46 am
It can be the voltage rectifier that starts to "act up" when it gets hot