Drz 400sm electrics tripping when starting?

hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

Hello all

So went to start the drz today i hear a click under the seat and all the electrics go off Thumbs Down

if i leave the bike all the electrics come back on after about 20 seconds but will not start

It happens as soon as i press the starter button

Ive had a look under the seat and behind the light but all looks well

Anyone no whats up its just had a new battery

Thanks

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

Was the 'new' battery fully charged at time of fitting?
SOme batteries are ready to go out the box but old tech wet batteries need a charge after filling with acid.

Or...

The connections are dirty. Clean all big connections between the battery and the main relay (the main relay controls and distributes power to everything on the bike.)

Or the main relay is goosed.

Why was the 'new' battery fitted? Was the old battery competently tested before scrapping?
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

Hi thanks for the replys

Well i went for a ride one day came back and the battery was dead

charged it up over night and it was still dead i could smell the acid

when i tried starting it so i put a new battery in it

Thanks

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

thanks

so i got a multimeter battery is around 12.5 volts and when running its around 14.3 volts irc also if i disconnect the battery while the bike is started and test the power going to the battery its around 6 volts

as soon as i press the starter button it will trip out and the battery goes as low as 1 volt

i can manage to start it sometimes but if i ride it it seems to trip out and the dash and lights flash i guess this is what is happening when i test it

any ideas have checked all the wiring and looks fine Question

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

14.3v on idle? that's a bit hi IMO, rev the bike up to about half revs and see what the voltage is it shouldn't be above 15.
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hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

So got the bike started

Checked voltage at battery when running is 13.9 v when i rev it goes down to around 13.5

Also found the short behind the headlight was a wire for the headlight bulb unplugged it and no more short the wire looks fine though

Seems it was an intermittent short because it wasn't happening all the time and i cant get it to happen now Confused

Could this have killed my battery was riding it about with the short circuit

Also checked the voltage coming from the stator i read it should be around 70 volts ac if i remember correctly im getting 13.9 volts ac and around 4 - 5 volts dc

Could it have been the short what killed my battery ?

Any ideas? Thanks

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

The battery was only £20 so tested the stator and rectifier they work as they should was testing them wrong at first

Took the bike for a ride to make sure it wasn't shorting out still with the wire unplugged i thought was doing it made it about 50 meters and it started shorting out again Sad

Makes me think is it possible for the battery itself to short out every time it shorts out i can smell the battery acid and could that be what is tripping out the electrics

I know the battery is knackered it will not hold a charge for long after the ride the battery is at 10 volts

Thanks Smile

MCN · Super Spammer Joined: 22 Jul 2015 Karma :

£20 for the size of battery seems cheap.
I would expect to pay £30-40.

The smell is H2S which is normal but as your battery has a fault that may be more persistent.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

hondakawasaki · Nova Slayer Joined: 03 Jan 2013 Karma :

just seems weird that the new battery died so quick and the battery before died the same way, that one didn't trip the electrics though

don't want to spend £40 on a new battery and the same happen again Confused

anyone recommend a good battery Question

thanks

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

The reg/rec sounds suspect to me. You have a good strong voltage at idle, but when you rev the engine the voltage drops.

Assuming you have a typical shunt-type reg/rec, it has 3 pairs of diodes that handle the shunting. Over time heat kills them. By the sound of it, one or two of the diode pairs has failed but at least one pair is still working - so the battery is still receiving a good charge at low revs when the diodes aren't having to switch very fast.

I would be replacing the reg/rec.