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 Post subject: Wiring diagram colours ?? uk -usa
PostPosted: Sun Aug 05, 2018 8:15 pm 
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Joined: Fri Aug 03, 2018 8:04 pm
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Location: Scotland
model: 750 Paso
year: 1990
RIGHT NEW TO THIS FORUM STUFF SO BARE WITH ME ?
DOES ANYONE KNOW IF THE RECTIFIER COLOURS FOR THE 750 PASO ARE ALL THE SAME FOR UK SPEC BIKES AND USA ?
MINES A UK SPEC. :shock:


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Mon Aug 06, 2018 3:16 pm 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
the original wiring colours should be the same, although if you look at the California Pasos's wiring, the two wires from the alternator are orange instead of yellow and at contact C there's a brown wire instead of a green/black one. If you have an aftermarket regulator it's possible its wiring colours are different.
What colour wires do you have? You can attach a picture to your posts.

Pls. don't type all caps, thanks.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Tue Aug 07, 2018 1:14 pm 
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Location: Scotland
model: 750 Paso
year: 1990
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reg rec2.jpg
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sorry about the CAPS, The after market reg is ok for the input from the generator usual two yellow and one red,
regulator / rec I have bought has two yellows two reds and black and white, black is case earthed and white prob' + output but means I have extra red mmmm?
tried to add a photo ? not sure it worked, man I'm rubbish at this .


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Tue Aug 07, 2018 3:53 pm 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
Do NOT ground the black wire! On many aftermarket regulators the black wire is a voltage sensing wire. That is connected to any hot lead that has 12V at ignition on. It should be connected to a wire that has stable voltage with no voltage loss. If the wire suffers from a voltage loss (compared to the battery's voltage) the regulator will try to compensate by increasing charge which over some time will kill the battery.
The white wire is for the charging warning light.
The two red wires can be joined. Also install an additional wire from the regulator housing to an existing ground point.
To be sure: the red wire of the alternator is NOT connected to the red wire of the regulator.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Tue Aug 07, 2018 4:20 pm 
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paso grand pooh-bah
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Joined: Sun Jul 18, 2004 12:00 am
Posts: 5237
Location: southern Germany
model: 750 Paso
year: 1987
- edited -

summed up:

regulator - original wiring
black - to ground
white - blue
red - red/black (not the red of the stator!)
red (join both red wires from the regulator)
yellow - yellow
yellow - yellow
red from the stator is not used
green/black from the bike's wiring harness is unused (isolate)

or

regulator - original wiring
black - to ground
white - blue
red - red/black (not the red of the stator!)
red (join both red wires from the regulator)
yellow - yellow (join both yellow wires from the stator)
yellow - red (from stator)
green/black from the bike's wiring harness is unused (isolate)

You'll have to see which of the two works. It's basically the same as described in these instructions:
https://app.box.com/s/r16ixjegwfl7aq3ybd0c


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Tue Aug 07, 2018 7:33 pm 
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Location: Scotland
model: 750 Paso
year: 1990
Ah man your a star i'll try that, just want it to be reliable and here in the uk weather can change quick so be using half decent connectors . Thanks again.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 8:03 am 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
there's contradicting information about the black wire if you search online. :banghead:
Here it says it is actually a ground connection:
http://www.tosave.com/p/Motorcycle-Volt ... 11247.html
Is that black wire as thick as the others or thinner and do you have an ohm meter?


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 8:11 am 
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paso grand pooh-bah
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If the black wire reads continuity to the regulator case it is almost definitely a ground wire. Connecting it to a switched 12V circuit will blow a fuse or burn something out.

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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 8:38 am 
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Location: Scotland
model: 750 Paso
year: 1990
I Derek that's what I was thinking, getting straight 0.0 ohms from case to black wire so direct connection, have had bike turning over, but not got the old carb back on yet so no real power out genny yet.
ive got another reg/rec coming from usa that's an electrix one or what ever its called but has better wiring info, 1st when I stripped bike I never took note of the wiring fitted to the old reg/rec due to working on loads of jap bikes spike here thought that the wiring dia would be spot on mmmmm, the output connector was burnt and the main head light connector, sure sign of over current.
2nd what a nightmare stripping the full bike down due to rust, but got it for a song so thought well 1st Italian bike in the stable so get on with it ya Tad!!!
cheers again spike.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 8:40 am 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
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Derek, it seems you're right. But if you look at other regulators tho the black is the sensor wire i.e. Electrex ESR540 or an original Ducati Energia regulator (pic below).
Also in the Electrex ESR510 instruction the black wire is mentioned.
Some regulators have a black ground wire, on others the ground wire is green.


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e1372_anschlussplan.jpg [ 26.18 KiB | Viewed 578 times ]
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electrosport-esr510-fitting-instructions.jpg [ 149 KiB | Viewed 578 times ]
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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 8:47 am 
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Location: Scotland
model: 750 Paso
year: 1990
paso750 the diagram shows a green wire as well must be the invisible one on the rectifier just not making sense, as I wrote to Derek the black is ground to casing, i'll await for the other reg /rec see how I get on with that, got loads of other things to do to the bike but getting there, tell you the visa is getting a kick in but hopefully worth it.
thanks again spike.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 8:51 am 
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Location: Scotland
model: 750 Paso
year: 1990
So in principle the green wire is just the same as the black as this is the negative earth through the bike ? the white looks like its the positive output to the battery, its just getting the correct connections into the loom that's bursting my peanut of a brain.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 9:28 am 
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paso grand pooh-bah
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Location: southern Germany
model: 750 Paso
year: 1987
Quote:
the diagram shows a green wire as well

Quote:
So in principle the green wire is just the same as the black

Careful. Let's put it like this. Usually on vehicle electrics black wires are ground, on some regulators tho (i.e. Electrex) ground is not black but green (see pic above). Let's also differ between regulator wiring and the bikes wiring harness. On your P750 the green/black wire is hot. It's the voltage sensor of the original regulator and is connected to the center fuse.
If you measure continuity between the black wire and the housing connect that wire to ground as you already did and isolate the green/black wire from the original wiring. As on the Electrex unit it's not used.
White is for the charge light.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 11:29 am 
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Location: Scotland
model: 750 Paso
year: 1990
white to blue, double up the red then to + ,black to earth and i'll make a link from case as well, then simple yellow to yellow leave out the red from gen' ,Bingo !!! should be onto a winner. grand cheers again for the help.


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 Post subject: Re: Wiring diagram colours ?? uk -usa
PostPosted: Wed Aug 08, 2018 11:46 am 
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paso grand pooh-bah
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Location: southern Germany
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it's either that or double up the yellow from the stator and connect those to one yellow from the regulator and the red of the stator to the other yellow of the regulator as per the Electrex/Electrosport instructions (first link posted). Since you verified that black is ground an additional wire to the case is not necessary.


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