Battery question

discussions specific to the 907IE
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H20doctor
Posts: 21
Joined: Thu Jun 11, 2015 7:31 am
model: 907 I.E.
year: 1993
Location: USA

Battery question

Post by H20doctor »

I haven't rode my motorcycle in 2 weeks when i went to go start it up dead battery. So... The battery is 2.5 months old.... Did the clock drain the battery ?

2Nd question.... When the bike is running what should the voltage read coming back to the battery from the charging system.... ?
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ducinthebay
paso grand pooh-bah
Posts: 1323
Joined: Sat Sep 03, 2005 12:00 am
model: 750 Sport
year: 1990
Location: SF Bay Area

Re: Battery question

Post by ducinthebay »

Yes, the clock on the 907 will kill your battery. Pull the fuse, or disconnect it. there is a thread that describes what trace to cut on the dash flex circuit. Need to keep the Paso on a trickle charge.

Voltage at the battery should be about 13.4 volts when fully charging.

Cheers, Phil.
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
H20doctor
Posts: 21
Joined: Thu Jun 11, 2015 7:31 am
model: 907 I.E.
year: 1993
Location: USA

Re: Battery question

Post by H20doctor »

seems kinda crazy that the clock can kill the battery in 7 days ....

if i put my volt meter on the terminals while the bike is running I should read 13.7 volts ? correct

if not , then what do i need to replace on the bike ...?

thanks
nickta
Posts: 295
Joined: Tue Jul 24, 2012 8:54 am
model: 907 I.E.
year: 1992
Location: Cairns, Queensland, Australia

Re: Battery question

Post by nickta »

The voltage will change depending on the RPM. At idle it will sit around 12.5 volts, and by about 3000 RPM will be up to around 13.5 - 14.0 volts. It shouldn't get any higher than 13.8 or there abouts, but plus or minus 0.2 volts isn't too bad. I wouldn't panic if it was little bit over 14 volts, but if it hit 14.5 or above, then you have an issue with the regulator. If it doesn't go up at all, then the regulator or the Stator is shot. There are a few posts about Regulators and what type etc etc. Different batteries take different charging patterns too. The 907 was built around a Lead/Acid battery. There are now all sorts, wet, sealed, AGM to name a few. I have had a Motobatt AGM battery in mine since I purchased it, and just replaced it with another Motobatt. The original lasted a bit over 3 years, and would still be good now, but that is another story. As a rule, if I don't think I will be riding it for 3 or 4 days, I disconnect the -ve terminal (the shed doesn't have power). Saves time and energy!

The bonus of an analogue clock is they take power to run. Others have replaced the Analogue with an LCD type if you would like to give that a crack?

Cheers.

Nick.
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MarkST
Posts: 92
Joined: Mon Dec 15, 2014 11:05 am
model: 750 Paso
year: 1987
Location: Sleepy leafy South Birmingham UK

Re: Battery question

Post by MarkST »

nickta wrote:I have had a Motobatt AGM battery in mine since I purchased it, and just replaced it with another Motobatt. The original lasted a bit over 3 years, and would still be good now, but that is another story.
I won't press you on that then Nick as I likely have a similar story involving an Odyssey battery, but must add that I now have a Motobatt AGM on my ST4S and can't sing it's praises highly enough !!
nickta wrote:The bonus of an analogue clock is they take power to run.
How is that a bonus ?

Mark.
2004 ST4S
2001 ST4
1987 Paso 750
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higgy
paso grand pooh-bah
Posts: 3327
Joined: Tue Jul 29, 2008 9:50 pm
model: 907 I.E.
year: 1992
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Re: Battery question

Post by higgy »

How is that a bonus ?

I think its spelled Bone Us Mark :thumbup:
Ducati,making mechanics out of riders since 1946
There's no problem so bad that a little fixing can't make it worse! : )
If it ain't broke keep fixin it till it is
88 750
90 906
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nickta
Posts: 295
Joined: Tue Jul 24, 2012 8:54 am
model: 907 I.E.
year: 1992
Location: Cairns, Queensland, Australia

Re: Battery question

Post by nickta »

MarkST wrote:How is that a bonus ?

Mark.
A figure of speech.
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MarkST
Posts: 92
Joined: Mon Dec 15, 2014 11:05 am
model: 750 Paso
year: 1987
Location: Sleepy leafy South Birmingham UK

Re: Battery question

Post by MarkST »

nickta wrote:
MarkST wrote:How is that a bonus ?

Mark.
A figure of speech.
As in 'a bad jam' is a really good tune ?
2004 ST4S
2001 ST4
1987 Paso 750
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paso750
paso grand pooh-bah
Posts: 5558
Joined: Sun Jul 18, 2004 12:00 am
model: 750 Paso
year: 1987
Location: southern Germany

Re: Battery question

Post by paso750 »

The clock shouldn`t draw so much power that the battery is flat after a week or two. Imho there`s something wrong.
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ducinthebay
paso grand pooh-bah
Posts: 1323
Joined: Sat Sep 03, 2005 12:00 am
model: 750 Sport
year: 1990
Location: SF Bay Area

Re: Battery question

Post by ducinthebay »

That's the way mine is. If the clock is running, the trickle charger will never keep up. I unplug the fuse when not in use.

Cheers, Phil.
Duc in the Bay
1990 750 Sport x2-Rosso Blanko (900ss copy) & Nuovo Nudo (Scrambler project)
1991 907 -mostly stock
2002 ST4s - Lots of mods.
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Rogero
Posts: 314
Joined: Fri Jun 17, 2005 12:00 am
model: 907 I.E.
year: 1992
Location: Cardiff, South Wales

Re: Battery question

Post by Rogero »

Alarm, clock and general Italian electrics.....

Plug it into an optimate charger whenever you are not using it. I got fed up replacing batteries - a charger is actually cheaper than a battery!

The clock on mine would not drain the battery in less than 10 - 12 days but the dreaded alarm does in less than a week. So combining the two which I have is hopeless !

Optimate (others are available) is the solution.
Rogero
1992 "Red" 907 I.E.
2006 Harley-Davidson Dyna FXDBI (Street Bob)
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