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Rapid Battery Discharge

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Syd View Drop Down
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    Posted: 23 Jul 2022 at 15:31
Hello Guys and Gals, I've been riding for 40 years, and have owned almost everything but a Harley. I bought my first Guzzi about 2 years ago (a 2005 750 Nevada Classic in beautiful condition), with19K on it. It's obvious that the previous owner took pride in keeping the bike up. My problem is the draining of the battery while sitting with the ignition off. This occurs in about 10 days, starting with a fully charged battery. I've read previous discussions on this subject in the forum before, but no permanent cure is mentioned. I will remove the 30 amp fuse for the ignition, but doesn't that screw up the clock, trip odometer, etc. every time you do it? I belong to the Motorcycle Sport Touring Association, and it isn't unusual to ride thru several states to reach a rally site. I'm somewhat hesitant to take my girl out dancing on such a trip! I'm really interested in installing an on-off switch, or circuit breaker somewhere in the harness that I can just cut off when I get off. Where might you folks suggest I try placing such a switch? You're far more accustomed to dealing with Guzzis than I! Thank you in advance for suggestions, Syd
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2022 at 20:55
If your battery is draining to the point of non start after 10 days, either your battery is well past it's best, or you have some additional drain. Guzzi recommend removing the fuse if laying up the bike for longer than this. It's the ECU and dash (including the clock) which cause the drain.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Steph Quote  Post ReplyReply Direct Link To This Post Posted: 23 Jul 2022 at 23:08
Years ago, I had a similar problem with parasitic draw.
I watched this a carried it out for troubleshooting.

The regulator/rectifier ended up being the issue.
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2022 at 22:34
I was going to say, need to do a parasitic draw test, eliminating components to see which is doing what. Regardless whether ECU and dash are permanently connected, should be able to leave it for a month, else it's pretty rubbish.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2022 at 21:43
Agreed, unless the battery is well past it's best.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jul 2022 at 09:33
What about a battery earth (ground) isolator. Or would that cause difficulties with the various electronics? I only have experience of the Guzzi dynamo system and other antiquated set ups.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken-Guzzibear Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jul 2022 at 10:13

You could fit one of these if the battery dies then it needs replacing for batteries I always use these people


I find when looking up a battery pop in the make/model of bike then look at the suggested battery specs size-A/H rating-Starting amps CCA and the warranty 

I found often the expensive ones actually are not always the better spec or even warranty.

Remember the AGM batteries need to be listed as able to charge on a wet charge system or they may fail prematurely I have had a Leoch battery (AGM but will charge on lead acid charge system) on my Cali EV for 5 yrs and so got one for the V1000 a while ago. it was around £35 lighter and smaller than the OEM car battery and they are doing the job 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jul 2022 at 23:05
Originally posted by Dave P. Dave P. wrote:

What about a battery earth (ground) isolator. Or would that cause difficulties with the various electronics? I only have experience of the Guzzi dynamo system and other antiquated set ups.


LOL you've never had a modern vehicle have you? Big smile Yes more aggro than it's worth.



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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jul 2022 at 07:59
The owners' hand book clearly says if the bke is being laid up for more than a few weeks, either diconnect the battery or pull the fuse. No need for any isolator switches.

But as it's discharging in 10 days, I would check with an ammeter what the drain actually is, though even so it will be small, in terms of just milliamps.
However, we don't know the age or condition of the battery. My guess it that it's well past its best. If it's lost half its capacity, then it will discharge to the point of no start in 10 days.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote c13pep Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jul 2022 at 08:54
Is it fitted with an aftermarket alarm if so start there 

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jul 2022 at 09:34
Originally posted by Mike H Mike H wrote:

Originally posted by Dave P. Dave P. wrote:

What about a battery earth (ground) isolator. Or would that cause difficulties with the various electronics? I only have experience of the Guzzi dynamo system and other antiquated set ups.


LOL you've never had a modern vehicle have you? Big smile Yes more aggro than it's worth.





Is it the isolator which is more aggro than it's worth or the modern vehicle?

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jul 2022 at 10:21
Isolator - not really needed.
Modern vehicle - you may have a point. Getting far too complicated for their own good.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 28 Jul 2022 at 11:15
Originally posted by Dave P. Dave P. wrote:

What about a battery earth (ground) isolator. Or would that cause difficulties with the various electronics? I only have experience of the Guzzi dynamo system and other antiquated set ups.

The previous owner of my LM2 fitted such a thing as an 'anti-theft' device.

Essentially the, easy to remove by hand, screw disconnected the battery negative from the bike frame meaning none of the electrics worked (and the clock stopped).

 

Seen in the above pic as the silver 'knob' on the frame just behind the RH carburettor. I've now disconnected it as I wanted a better earth connection plus didn't want to be stranded if it fell out or was nicked and, I doubt it would stop a determined bike thief? I left it fitted though as it hides the hole in the frame - not sure if this hole is normally there or if it was a 'period' immobiliser?   LOL 


Edited by Dukedesmo - 28 Jul 2022 at 11:24
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Mike H View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mike H Quote  Post ReplyReply Direct Link To This Post Posted: 29 Jul 2022 at 19:19
Originally posted by Dave P. Dave P. wrote:


Is it the isolator which is more aggro than it's worth or the modern vehicle?

I'll get me coat !!!


The latter – digital thingies that lose their settings memories .. Big smile

Putting them back means manually reseting each time and that will quickly get tedious. Heck can be tedious if only occasionally!



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Post Options Post Options   Thanks (0) Thanks(0)   Quote rapheal Quote  Post ReplyReply Direct Link To This Post Posted: 31 Jul 2022 at 22:45
my breva does the same
i have a battery conditioner plugged into it
problem sorted
if you do not have a mains power outlet handy, then a solar charger works just as well
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