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 Post subject: Bloody electrics yet again. Looking for Directions.
PostPosted: Sun Jan 14, 2018 4:45 pm 
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paso grand pooh-bah
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Joined: Wed Apr 09, 2008 9:57 pm
Posts: 1033
Location: Manchester, England.
model: 907 I.E.
year: 1992
Okay before I go down a complete re wire route I would appreciate some advice / direction / confirmation if possible please.

DUCATI 907ie

Last year I was plagued with electric gremlins throughout the year winter, spring, summer and autumn, so much so that I probably spent a third of my time pushing the bloody bike on what rides I took on the bike. Each time was an electrical issue of some kind and the purchase of new rectifier(s), new coils, new battery, new fuse box, new starter solenoid, new earth and live wire lead replacements, a few partial short rewire projects or simply a few wire block cleans appeared to resolve the issue enough to suggest the problem was resolved.

IT WASN'T ??????

I know these are 20 year old Italian electrics but still this is now getting beyond a joke and means other projects have been shelved or abandoned.

The present state of play is this

The battery died as it was not charging on a run.

I checked everything but was aware that the charge light was not on with ignition so checked bulb and that was fine.

I then put a new rectifier on and this seemed to resolve the issue with a nice bright and correct charge light on ignition on, but...............

When I flipped the right hand kill button to on ready to press the start button it killed the charge light and blew the 15amp fuse in the left hand relay (closest to the blue block). The fuel pump was also dead. But the bike turned over on the starter and everything else worked but obviously wont start as the pump is now dead. All the leads to the fuel pump are perfect and wired correctly.

I then replaced the rectifier with the old one fitted and it was back to a dead to very dim ignition charge light and no charge from the alternator.

Where to next folks?

I have not yet done the upgrade rewire for the starter yet either before anyone asks.

Any help gratefully absorbed :thumbup:

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Sun Jan 14, 2018 8:30 pm 
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Joined: Sun Jan 10, 2016 4:13 pm
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Location: Tring Hertfordshire , UK
model: 907 I.E.
year: 1992
Hi Stiv, I think I would remove all the body work and thoroughly inspect all the loom for chafing, bad earth connections and check all connectors are corrosion free. Another thing to check is the ignition switch, 2 off my Benellis have had to have new switches fitted in recent years because the were badly corroded on the contacts.
Hope this helps!

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Sun Jan 14, 2018 10:01 pm 
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paso grand pooh-bah
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Joined: Wed Apr 09, 2008 9:57 pm
Posts: 1033
Location: Manchester, England.
model: 907 I.E.
year: 1992
Did all that last year three times with the bodywork off each time and found a few small areas that I tidy up or re wired. I can't see it being the ignition switch as the battery light wouldn't be different.

I am going to re check all the earth points again I have the original rectifier sitting around somewhere which I will try. I also need to add that the battery light had worked fine on all three rectifiers when each was fitted.

Don't want to throw another £90 plus at another rectifier until I know for sure these are all useless.

I am wondering if the alternator is at fault? is there anyway of checking the voltage out of it in situ?

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Mon Jan 15, 2018 3:30 am 
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paso grand pooh-bah
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Location: Newzealand
model: 906 Paso
year: 1990
Yeah man , just kick her in the guts and put your meter across the batt and you should see about 13.5 - 14 vdc with about 3 grand on board . This will tell you if the whole charging system is working but wont really give any indication of battery condition . if there is an issue probly would be to check alt output at the alt , cant remember what it should be but it has been discussed here before ( I think its about 90 -120 vac ) and if that is ok your back to the reg/rect , but I wouldn't fit another coz ( sorta obviously ) there must be a reason for them to keep chundering............are you sure they are of a high enough capacity ?

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Mon Jan 15, 2018 9:27 am 
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paso grand pooh-bah
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Ignoring the alternator and regulator/rectifier. You wrote that the fuel pump is dead but the starter still turns. That's normal looking at the 907IE's wiring. If the fuse in the relay blows it will kill the power to the fuel pump and to the coils/iginition modules. The question is why it blew. Things that could cause this would be a short in the fuel pump or it's wiring, a problem in the ignition modules, the wiring to the coils or the wiring from the ECU to the ignition modules.

Did you replace the old coils with original ones? Same questions for the regulator.

You said you had replaced the fuse box. Is there a 25A fuse where the wire from the battery comes in and two 15A? Are they all still ok?


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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Mon Jan 15, 2018 9:48 am 
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paso grand pooh-bah
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year: 1994
paso750 wrote:
Ignoring the alternator and regulator/rectifier. You wrote that the fuel pump is dead but the starter still turns. That's normal looking at the 907IE's wiring. If the fuse in the relay blows it will kill the power to the fuel pump and to the coils/iginition modules. The question is why it blew. Things that could cause this would be a short in the fuel pump or it's wiring, a problem in the ignition modules, the wiring to the coils or the wiring from the ECU to the ignition modules.

Did you replace the old coils with original ones? Same questions for the regulator.

You said you had replaced the fuse box. Is there a 25A fuse where the wire from the battery comes in and two 15A? Are they all still ok?

What he says.

And as for the charging: What Hamish says about the voltage across the battery when the engine is running.
To check the alternator - disconnect the 2 yellow wires from the regulator. Measuring resistance across the 2 wires you should get quite a low reading, only an ohm or two. Measuring between any of the two and earth you should get no reading. With the engine running and meter connected across them set to read AC volts, you should read approx. 15 AC / 1000rpm.

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Tue Jan 16, 2018 2:04 am 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
also be sure to check the fuel filter.Clogged filters are the root cause of many dead charging systems on a 907

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Tue Jan 16, 2018 6:01 am 
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paso grand pooh-bah
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Location: Newzealand
model: 906 Paso
year: 1990
higgy wrote:
also be sure to check the fuel filter.Clogged filters are the root cause of many dead charging systems on a 907

Shhhh , dont nobody ask how or why :D he he he

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 Post subject: Re: Bloody electrics yet again. Looking for Directions.
PostPosted: Wed Jan 17, 2018 5:32 pm 
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paso grand pooh-bah
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Joined: Tue Jul 29, 2008 9:50 pm
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Quote:
Shhhh , dont nobody ask how or why :D he he he



How ? Why ? :mrgreen:

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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
92 907ie


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