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 Post subject: Electrical gremlins
PostPosted: Sat Sep 14, 2019 12:22 pm 
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Joined: Wed Oct 31, 2018 8:17 pm
Posts: 24
Location: UK
model: 750 Paso
year: 1985
Hi

Looking under the seat today I can see that three electrical connectors have overheated to the point of melting. I think they are wires from the regulator rectifier... any idea what might be causing this?

I am not knowledgeable about motorcycle electrics ... so keep it simple please!


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 Post subject: Re: Electrical gremlins
PostPosted: Sun Sep 15, 2019 9:08 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 734
Location: Scotland
model: 907 I.E.
year: 1994
The regulator wire carry quite a high current and oxidation of the connector surfaces will create resistance which in turn generates heat which will encourage more oxidation making the situation worse with the result that the connectors eventually burn out, the insulation melts or the resistance gets so high that no current flows. You potentially risk a fire and most certainly a non-charging battery.
Replace all the connectors on both sides of the junction with good quality items that are more than up to the electrical current requirement. Also replace any damaged wiring, again using suitably heavy duty wire.

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2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL (now sold)


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 Post subject: Re: Electrical gremlins
PostPosted: Sun Sep 15, 2019 9:47 am 
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Joined: Wed Oct 31, 2018 8:17 pm
Posts: 24
Location: UK
model: 750 Paso
year: 1985
Thanks Derek

That is very helpful.

Anyone able to suggest a good quality connector and supplier in the UK?

This forum is super helpful... thanks Pasoists


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 Post subject: Re: Electrical gremlins
PostPosted: Mon Sep 16, 2019 8:03 am 
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paso grand pooh-bah
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Joined: Thu Nov 03, 2011 10:13 am
Posts: 734
Location: Scotland
model: 907 I.E.
year: 1994
I regularly deal with these firms;
http://www.vehicle-wiring-products.eu/
http://www.polevolt.co.uk/
https://kojaycat.co.uk/

Their products cover a wide range of general and specialist applications. I use whichever one has what I need at the best price at any time.

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1994 907ie
2017 Supersport 939
2015 Scrambler Classic
1982 Pantah 500SL (now sold)


Scotland


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 Post subject: Re: Electrical gremlins
PostPosted: Mon Sep 16, 2019 10:04 am 
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Joined: Wed Oct 31, 2018 8:17 pm
Posts: 24
Location: UK
model: 750 Paso
year: 1985
Hi

Thanks for the links.

Replaced the melted connectors and it looked like one was broken but just touching.

Bike now not charging... so I need to try and work through that.


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 Post subject: Re: Electrical gremlins
PostPosted: Sun Sep 22, 2019 2:38 pm 
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Joined: Wed Oct 31, 2018 8:17 pm
Posts: 24
Location: UK
model: 750 Paso
year: 1985
Ok... so I just want a basic charging circuit. I have bought a generic 5 wire reg/rec and connected the two yellow and red wire from the stator, linked the live and wired the ground to the battery. I have charge.

Is this ok to do? Will I combust?

Thanks in advance...


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 Post subject: Re: Electrical gremlins
PostPosted: Thu Jan 02, 2020 5:17 pm 
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Joined: Sun Feb 17, 2013 9:44 pm
Posts: 2
Location: USA
model: 750 Paso
year: 1988
When my voltage regulator burned out right from the beginning I took a hard look and saw the potential problem of corrosion under the seat, mainly the use of dissimilar metals (aluminum mounting panel). I then ran heavy gauge (10ga) copper wire from the ground mounting bolts of all the individual components directly to the battery negative earth terminal. All these years, never another electrical problem or corrosion anywhere.


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 Post subject: Re: Electrical gremlins
PostPosted: Fri Jan 03, 2020 12:44 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1742
Location: Newzealand
model: 906 Paso
year: 1990
Things like this can be hard on the brain...because upon eyeballing the problem the solution seems so simple and obvious one wonders why it wasn't done at the factory, and then the self doubt creeps in ..."I must have got this wrong ......seems to easy " . Call me cynical but I think that at the time Ducati had nothing in the piggy bank and keeping costs down was critical to survival and thusly things were speced to scrape thru the warranty period, not to last 30 years. Replacing or upgrading (fitting relays )fried connectors is as easy as it looks .

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 Post subject: Re: Electrical gremlins
PostPosted: Fri Jan 03, 2020 2:39 am 
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Joined: Sun Feb 17, 2013 9:44 pm
Posts: 2
Location: USA
model: 750 Paso
year: 1988
You are just asking for corrosion anytime aluminum is attached to steel, especially when it is being asked to carry an electrical current. Hence that aluminum mounting plate for the electrics on the 750 Paso would soon result in all kinds of electrical problems.


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 Post subject: Re: Electrical gremlins
PostPosted: Fri Jan 03, 2020 8:54 pm 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
Posts: 1742
Location: Newzealand
model: 906 Paso
year: 1990
The ally plate on my Paso is used to mount all the gubbins but it is not being used as an earth, and never was.

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