750 Paso Wiring Upgrade to Improve Starting

naster · Post by **naster** » Thu Mar 17, 2005 6:52 pm

These wiring mods sound great, but i can't download. Just does'nt work on my computer. Can someone help. Please.

Post by **Skins** » Thu Mar 17, 2005 7:32 pm

I dunno how computers work, naster, but it seems email is the best way to send and receive this material. I have a copy which I can email to you if you send me your email address.

sv2dfu · Post by **sv2dfu** » Thu Apr 28, 2005 11:57 am

hello everbody, this is my first time in any paso forum.
anyway, I tried to download the jcslocum wire mods but with no success. Anybody that can, please email them to me
at sv2dfu@gmail.com

thanx again
Peter from Greece
paso750

Post by **Skins** » Thu Apr 28, 2005 8:03 pm

Just sent u a copy. Let me know if you have any trouble receiving.

Post by **jcslocum** » Fri Apr 29, 2005 12:27 am

It's a PDF file so you will need to have Acrobat reader installed on your computer.

Get it here for FREE!:

http://www.adobe.com/products/acrobat/readermain.html

sv2dfu · Post by **sv2dfu** » Wed May 04, 2005 9:21 am

many thanks to Jon Slocum, Paul Hollich and Erskine Hewett for
your immediate responding, to my request for help.
Good to know that there are people out there willing to help
each other.
Will try the mod and come back with a report, just to let you
know what happenned.
Thanx again.

sv2dfu · Post by **sv2dfu** » Mon Jun 13, 2005 12:40 pm

sorry, didn't try the mod yet because of many problems with the bike.
Urgent help needed: If anyone knows about any good service shops in Italy that I could contact, please let me know as soon as possible.
I will be in Italy about June 27th and will stay a week.
Preferably at areas near Toscana..but not necessarily. I will travel where ever you could suggest a good mechanic.
Please help, I am desperate.

Post by **Skins** » Mon Jun 13, 2005 8:09 pm

Look up member No 64 on the member list, 'ducapaso', and send him an email. Perhaps he can help.

sv2dfu · Post by **sv2dfu** » Tue Jun 14, 2005 10:54 am

thanx again for your help, will look to it.
GO NZ!!

lceriani · Post by **lceriani** » Tue Jul 12, 2005 10:39 am

I just found some interesting articles about a similar mod applyed on BMW F650:
http://faq.f650.com/FAQs/FlayingtheVRFAQ.htm
http://faq.f650.com/FAQs/VoltageRectifierFAQ.htm

Here's the schematics:

As you see, the circuit differs slightly from the one proposed by jcslocum: in this one there's a diode connected to the 2 coil terminals of the relay... why? Here's the author's explanation:

If I were to install such a relay, I would put a 1N4001 diode backwards across the relay coil. The flat of the triangle (anode) goes to the ground end of the relay coil and the point of the triangle (cathode) goes to the (switched) +12V end of the relay coil. Why? Because a coil stores energy in the form of a magnetic field that is returned as current just as a capacitor stores energy in the form of an electric field (voltage) that is returned as current. The current through a coil can NOT instantaneously go to zero. If you are LUCKY, when you switch off the key, the energy will be dissipated in the arc across the open contacts of your ignition switch, which is not at all good for long switch life. Why is that LUCKY? Because if the energy is NOT dissipated in your ignition switch, it will appear as an ARC INSIDE YOUR VOLTAGE REGULATOR via that green wire you hooked to the relay coil. The diode costs less than a dollar. I could be wrong about the need for it. It's your US$250 regulator at risk, not mine. If I make this mod, you can bet your ass that mine will have the freewheeling diode bassakwards across it.

I think it's reasonable and I'll try this on my Paso, but maybe it's an eccessive caution: does anyone experienced problems with the original relay mod?

LC

Post by **Skins** » Tue Jul 12, 2005 5:54 pm

I installed Jon Slocums wiring mods (one relay for the starter and one for the coils) about six months ago, and the bike's been running very well. However, she's had light use, probably not much more than 1000 km, and I haven't used the lights at all.

I've read about relays occasionally playing up because of residual current, or whatever. But Jon's mods don't involve the regulator as in the above diagram, so surely I don't need to worry about my regulator, do I?

lceriani · Post by **lceriani** » Wed Jul 13, 2005 7:58 am

The regulator is connected to the ground and to the positive (+) battery pole, so it is connected to all the loads attached to the (+) line, relais included...

LC

Post by **Skins** » Wed Jul 13, 2005 8:22 am

Thanks, Luca. I'm not very good with electrics. But I'm a little better now than I was five minutes ago.

lceriani · Post by **lceriani** » Wed Jul 13, 2005 9:58 am

Just for who is able to manage schematics, here is the M900 simplified schematics:
http://www.freefotofile.com/ims/pic.php ... XKC&i=1326
And here is the same schematics base, but with the jcslocum mod upgrade:
http://www.freefotofile.com/ims/pic.php ... XKC&i=1329

As you see, they are quite similar.
The differences:
- jcslocum mod get main power feed (connector #87 on relay) directly from the (+) battery through a 30A fuse, while Ducati connects the relay to the existing fuse box, in parallel to the wire that goes to the key switch (jcslocum mod has less voltage drop)
- Ducati M900 uses a fused line to send directly the voltage reference to the Voltage Regulator, while jcslocum mod keeps the voltage reference connected with the other loads (I measured a 0,1V differences beetween the two options)
- Ducati M900 insert a 30A fuse to the line that connects the voltage regulator to the battery (so if the voltage regulator overcharge too much, maybe it will be disconnected before breaking)
- Ducati M900 doesn't leave anything exept the solenoid directly connected to the bttery (without fuse), while Ducati Paso leaves ... the clock connected unfused! So if the clock (or more probably the wire/connectors to the clock) "goes to ground", the battery is damaged with no protection
- Ducati M900 uses a diode 1N4007 to protect the solenoid

Definitively, I think that jcslocum mod not only is correct (we already knew it!), but it is very good because it permit to apply the same main wiring upgrade that Ducati put in recent models in the bad and old Paso schematics with a very little intervention.

However I would like to completely renew the power feed schematics tryng to apply the M900 ideas. I'm afraid it would not to be an easy work, but I'll keep you update on the results...

LC

Rodney · Post by **Rodney** » Thu Jul 14, 2005 6:43 am

:lick: have just purchased a paso wiring loom with the intention
of modifiying it to improve the cable size and the way that it is
done hopefully i can incorparate the wiring upgrades into it for
the ignition and lighting relays so it does not look like a butchers
job as near the head stock it looks like a tangled spaggetti at
the moment with the relays for the headlight.
will let you know on the success of it when i get it done will also
try and post some pictures.

Rodney

750 Paso Wiring Upgrade to Improve Starting

THANX