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 Post subject: Coil Relay installation.
PostPosted: Mon Oct 21, 2013 12:24 pm 
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Joined: Wed Jun 17, 2009 3:18 pm
Posts: 14
Location: North West of England
model: 906 Paso
year: 1991
Hi guys,
I hope that someone can clarify something for me regarding the coil mods.
I apologise, but I am not an electrician and rather than making a mistake I would be grateful if someone can help me.
I have looked at the advice from Romus, Jonathan Slocum, David Hooau and paso750.
I have bought a pair of dc3-1 Dynatek coils to make a better job and my problem is what to do with the wiring that seems to be connected to the ignition system that is not mentioned. in particular the pink on the rear coil and the yellow/green on the front. I assume that these need to be connected back to the orange (9) and the Yellow/Green (11) on the digiplex.
I am mounting the relay on the wiring side of the tool tray and there seem to be a number of possible connections that may be made and I wonder if there is a preferred point, e.g. cutting into the red at the connector block where the Black/Green from the fuse is connected to the Red, Brown and Purple OR from the Red closer to the coils themselves with this cable pulled through from the connector block. ?
Another thing is the fuse rating to br used JS uses a 10Amp and Romus and DA use a 20Amp ?
Thanks for any information.


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 Post subject: Re: Coil Relay installation.
PostPosted: Mon Oct 21, 2013 5:22 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
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Location: southern Germany
model: 750 Paso
year: 1987
there`re different places in the wiring loom were a relay can be placed.
The pink and the yellow/green are the ground signal (-) that the coils get from the Digiplex unit.
The red wires are the 12V connections. What you see in this simplified picture is one red wire which connects both coils. The second red wire on the first coil is the 12V feed (running via the ignition switch).
What you do is cut this wire at a suitable point and implement the relay.
A 10A fuse will be fine.


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 Post subject: Re: Coil Relay installation.
PostPosted: Mon Oct 21, 2013 5:36 pm 
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Joined: Wed Jun 17, 2009 3:18 pm
Posts: 14
Location: North West of England
model: 906 Paso
year: 1991
Thanks a lot for the reply.
I thought that this was the case but the more I looked at the wiring diagram with its changing colours and the different descriptions of methods used the more confused I became.
Thanks again.

PS.
I have got some relays with fuses built in and they should make for a neater installation.


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 Post subject: Re: Coil Relay installation.
PostPosted: Tue Oct 22, 2013 3:29 am 
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paso grand pooh-bah
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Joined: Wed Dec 05, 2007 12:35 am
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Location: Newzealand
model: 906 Paso
year: 1990
I gotta say that when looking at ducati wiring diagrams some confusion is to be expected . There are a lot of ways to do this mod , I have opted to power both the coils and the digiplex off the same relay ( relay is switched from the kill switch ) . Fused relays are a tidy unit but I think they are best if they are close to the power supply , I cant see the sense in running a unfused power wire from one end of a vehicle to the other and then sticking a fuse on it , Fuses should be fitted as close to the supply as possible but I needed to replace the fuzebox anyway ( and I already had them in a box somewhere ) so there they are :)
Image
. The other relay is the main relay , and there are 2 more up the front for the lights :)

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 Post subject: Re: Coil Relay installation.
PostPosted: Tue Oct 22, 2013 12:35 pm 
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Joined: Wed Jun 17, 2009 3:18 pm
Posts: 14
Location: North West of England
model: 906 Paso
year: 1991
Thanks Mc tool,
It looks a really neat installation.
I'm glad that its not just me finding the wiring, diagram and loom, as being confusing.
It sounds a good idea to use the kill switch.
I agree about the positioning of the fuse totally.


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 Post subject: Re: Coil Relay installation.
PostPosted: Tue Oct 22, 2013 8:39 pm 
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paso grand pooh-bah
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Location: Newzealand
model: 906 Paso
year: 1990
Wiring diagrams get easier with a bit of practice , and soon you will be wondering what all the fuss was about . Wires do change colour sometimes and they do dumb things , look at P750's diagram and see that the power wire ( R ) that joins coil 29 to coil 30 . .. even tho the 2 coils are physically only 6" apart this power wire does a whole lap of the bike , goes thru a plug and arrives back where it started :?: :?: .
Another good mod is to fit relays to the headlights and there is a kit available to boost starting power that contains new cables

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 Post subject: Re: Coil Relay installation.
PostPosted: Wed Oct 23, 2013 3:36 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
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Location: southern Germany
model: 750 Paso
year: 1987
for everyone who looses the overview this is the wiring plan reduced to the very basic circuits of starter & ignition.
As can be seen the fuses two and three are fed by the first fuse so almost all current required by the bikes` electrics runs via the ignition switch. (No idea Hamish how your electrics works with only two 7,5A fuses :) ).
The ECU gets its 12V via the kill switch, fuse two and the ignition switch.

Image

The simplest way of the coil wiring mod (same as posted above)
Image

Another possibility which will also stabilize the voltage at the ECU
Image

Bypassing then ignition swich can improve the whole electrical system (it also removes the complete electrical load from the ignition switch). This option will require proper sized wires.
Image

No need to say there`re other possibilities as well.

I`m repeating myself when saying it`s important to check the regulator/rectifier before any relay mod.
A faulty reg/rect can put out over 16V which after a relay mod will get directly to the bulbs, coils, Ecu etc. which can have consequences. This is the only situation in which the original wiring with its voltage drops could actually be an advantage as it may prevent any possible damages.

Quote:
Wires do change colour sometimes...

Like the wire to the horn that according to the wiring plan starts as orange-red but gets to the horn as grey while there`s no connector in the drawing :lol:

G.


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 Post subject: Re: Coil Relay installation.
PostPosted: Wed Oct 23, 2013 9:44 pm 
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paso grand pooh-bah
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Location: Newzealand
model: 906 Paso
year: 1990
Cool diagrams G , I have some "office 13 " thing that is supposed to be able to do that.
Any how , I sorta got a bit "enthusiastic" and stripped the whole harness , removed some wires and added and moved some others , relocated the fuse box and the solenoid. The fuse box contains fuses for the headlight relays , the charging system , the cooling fan, and a feed to the ignition switch which now only switches the main relay and the park lights . And yes G , those fuses were the only ones I had left after the ( incorrectly wired relay ...... ya gotta watch that ... pins in the same place but wired different inside ) small glitch , and were there mostly to complete the circuts so I could test em . The red heat shrink cable comes from the battery feeds all the fuses and then comes down the side of the digiplex to feed the main and ignition relays . Next job is to sort the charging system .... works ok but some one has bodgied a Honda ( I think ) reg/rect in there and there are spare wires and lots of joins , AND the battery always seemed to get thru a bit of water ( and didn't last long ) so I think I will get me the proper after market one :)

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 Post subject: Re: Coil Relay installation.
PostPosted: Fri Dec 06, 2013 1:29 pm 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
I found this pic recently and think it explains the basic issue very well :)


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 Post subject: Re: Coil Relay installation.
PostPosted: Fri Dec 06, 2013 6:56 pm 
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paso grand pooh-bah
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model: 907 I.E.
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paso750 wrote:
I found this pic recently and think it explains the basic issue very well :)

I like that :lol:

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 Post subject: Re: Coil Relay installation.
PostPosted: Sat Dec 07, 2013 12:35 am 
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paso grand pooh-bah
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Location: Hilltown,Pennsylvania
model: 906 Paso
year: 1990
Italy has historically, like the old Germans had the worst electrical diagrams on the planet, It took the Japs to sort it out in plain english which by the way is a totally backwords language to most cultures on the planet earth


btw G's Illustration in symbolic language is V=I/R It truly is simple


NO MATTER HOW MANY VOLTS YOU HAVE, THE CONDITION OF THE WIRES, SIZE,SHAPE AND CORROSION WILL LIMIT THE AMPS DELIVERED TO DO THE WORK


SO NO MATTER HOW MUCH MANAGEMENT WANTS THE WORK TO BE COMPLETED,(VOLTS) LIFE(RESISTANCE) WILL ALWAYS CHOKE THE ACTUAL WORK COMPLETED(AMPS)

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 Post subject: Re: Coil Relay installation.
PostPosted: Sat Dec 07, 2013 10:50 am 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5359
Location: southern Germany
model: 750 Paso
year: 1987
the strange thing is Italy was never known for good electrics but they do really well in electronics.


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