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 Post subject: Gen warning light always on?
PostPosted: Sat Dec 19, 2015 7:54 pm 
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Joined: Sat Dec 19, 2015 6:06 pm
Posts: 12
Location: New Zealand
model: 750 Sport
year: 1989
Hi,

My battery dash light is always on. It's a new bike so I'm not sure if this is new or an old issue. I've got a few things to check today; standard charging system diagnostics.

In the meantime I was looking at the 750sport and 750paso workshop manuals and they both say this:

Gen. Warning light. It must light up when the system is fed by rotating the switch key and must remain on either if the engine stops or is running at any rpm.

Am I reading that right? Always on? Off indicates an issue? I have a mate with a an old Ducari GT and his charge light works in this manner. All my other bikes have had the light come ON to indicate charging issues.

Thanks,
Rich


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 Post subject: Re: Gen warning light always on?
PostPosted: Sun Dec 20, 2015 10:28 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 518
Location: Scotland
model: 907 I.E.
year: 1994
Connect a meter across the battery and start the bike. If the voltage rises to around 14V or so then it's charging fine regardless of what the lamp does.

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 Post subject: Re: Gen warning light always on?
PostPosted: Sun Dec 20, 2015 8:01 pm 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1533
Location: Newzealand
model: 906 Paso
year: 1990
AND some of the early replacement units didn't have provision for the charge light so I guess individuals may or may not wire in that light some how , but as Derek sez put a volt meter over the battery , if its charging and its still pissing you off take the bulb out :)

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 Post subject: Re: Gen warning light always on?
PostPosted: Mon Dec 28, 2015 11:09 pm 
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Joined: Sat Dec 19, 2015 6:06 pm
Posts: 12
Location: New Zealand
model: 750 Sport
year: 1989
Thanks for the tips. Yes, I checked the charging voltage. 12-13v at idle and 14 or a bit more at 5k rpm. That seems fine. After that the light has gone out. Odd, but all good I guess.


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 Post subject: Re: Gen warning light always on?
PostPosted: Tue Dec 29, 2015 1:03 am 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3152
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
not at all fine.............not even close

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 Post subject: Re: Gen warning light always on?
PostPosted: Tue Dec 29, 2015 4:11 am 
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Joined: Sat Dec 19, 2015 6:06 pm
Posts: 12
Location: New Zealand
model: 750 Sport
year: 1989
Not even close? Care to elaborate and help me out a bit here? I would've thought 14v is good. It doesn't go much more than .1 or .2 higher. Not high enough to lead me to suspect a regulator issue. Unless I've been misled on the optimal voltages but that's what I have found mentioned on these boards when I searched before posting.


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 Post subject: Re: Gen warning light always on?
PostPosted: Tue Dec 29, 2015 8:09 pm 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1533
Location: Newzealand
model: 906 Paso
year: 1990
Old elecrtix on these ducati's ( Paso's too ) are real good at being bad when the get a few years under their belts ( change them too ). Pays to give the whole plot a good going over to help prevent strandings , I think that's what Higgy's meaning , is just because its going now doesn't mean it will keep going ............ actually the fact that it works now is all the proof you need that it will crap out , oh yeah ..... they never do it at home either

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 Post subject: Re: Gen warning light always on?
PostPosted: Tue Dec 29, 2015 8:34 pm 
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Joined: Sat Dec 19, 2015 6:06 pm
Posts: 12
Location: New Zealand
model: 750 Sport
year: 1989
I hear that! Thanks.


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 Post subject: Re: Gen warning light always on?
PostPosted: Tue Dec 29, 2015 8:46 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
Posts: 3152
Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Hamish has the idea. On my 907 with dual headlights I had the stator rewired as a two wire with leads that are long and go all the way to the shendengrin mosfett regulator now located at the rear of the bike. I also installed a dual relay setup to supply the headlights. I now get 14.4 volts at the battery once the regulator warms up. The only time I see less across the battery is when cold or the fan runs with the headlight is on while at idle . then never less than 12.5 and increasing rpm to 1500 it comes right back to 14.4

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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
92 907ie


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