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Author Topic: UK 400 Four wiring diagram?  (Read 3303 times)

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Offline GroovieGhoulie

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UK 400 Four wiring diagram?
« on: July 10, 2007, 06:00:09 PM »
Does anyone have a wiring diagram for the UK-spec 400/4? 

I bit the bullet and bought the UK-spec switchgear from DSS because I want the on/off switch and the flash-to-pass switch.

Problem is the new controls have more connectors than the US-spec switches some wires are different colors.  I am wanting to see how the colors are supposed to line up, along with seeing how I'm probably gonna have to re-engineer/re-wire the harness to accept the new connectors.

And for anyone who is wondering, it is clear that the US and UK bikes had DIFFERENT wiring harnesses, not identical harnesses with different switches, as everyone, (including me), thought.

This is going to be a challenging project, but when it is done, I am sure I will have one of the only 400/4s in the US with a factory light switch.  That will make me happy.
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Offline bryanj

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Re: UK 400 Four wiring diagram?
« Reply #1 on: July 10, 2007, 06:06:29 PM »
The parts list i have only lists one loom for all markets so it ought to fit, I do have a diagram somewhere in among the 100's of boxes from the recent move, if nobody else chips in PM me and i will go ferret for it
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

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Offline GroovieGhoulie

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Re: UK 400 Four wiring diagram?
« Reply #2 on: July 10, 2007, 06:14:39 PM »
Hmm...That's good to know.  The connectors must be routed differently though.

For example, in the US RH control, there are five wires coming out.  Two killswitch, three start button and one I don't know about.

On the UK switch, there are seven.  Two start button, two killswitch and three for the lightswitch.  The colors are different on them as well.

On the other side, there are a similar number of wires between the US and UK switches.  This gives us a surplus of wires and the loom that they plug into doesn't have any extra plugs when the US ones are plugged in.  This leads me to believe that I need to re-wire the loom some to allow for the lightswitches.

The gauge lights, for example, which on UK bikes normally come on only when the switch is put in the "Pilot" position, are wired to the main key switch on US bikes so they come on when I turn the key.  Need to figure out how to fix that.
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Offline GroovieGhoulie

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Re: UK 400 Four wiring diagram?
« Reply #3 on: July 11, 2007, 06:29:59 AM »
Wired it up this morning.  95% there.

Got the RH control all worked out, killswitch, start button and lights.  Like the UK bikes now, I no longer have the orange "running lights" on low-beam, but I really don't care that much.  The "Pilot" position is the gauge lights and taillight.

However, I've got a problem with the LH control.  When I have everything plugged in, I still have no horn or flash-to-pass.  Now, I have a black wire left over, which I believe is a ground, but there are no ground plugs left in the wiring harness.  When I unplug one of the other grounds and plug it in, I get the flash-to-pass button, but no horn.  When I plug the black wire into the light green horn wire, I have no horn, but when I push the FTP button, I get horn.

There are two empty plugs, an orange with white stripe, and a light blue with white stripe.  These have to do with the orange running lights, for when I plug the horn ground into one of them and press the horn button, one of the lights lights up.

What to do?  I'm so close, I can taste it.  Where to "find" another ground plug?
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Offline bryanj

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Re: UK 400 Four wiring diagram?
« Reply #4 on: July 11, 2007, 07:09:07 AM »
The black is a power wire to feed the headlamp "flash" and posibly the horn.

BEWARE!!!!!!

Check out the horn carefully as some were powered when ignition on and ground via the switch whilst others have a groound "link" wire and are powered by the switch.

I have seen both types on different years of the same model
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Semi Geriatric ex-Honda mechanic and MOT tester (UK version of annual inspection). Garage full of "projects" mostly 500/4 from pre 73 (no road tax in UK).

Remember "Its always in the last place you look" COURSE IT IS YOU STOP LOOKIN THEN!

Offline GroovieGhoulie

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Re: UK 400 Four wiring diagram?
« Reply #5 on: July 11, 2007, 09:59:54 AM »
OK, I think I got it sorted, now I just need to do some "engineering".

Per your advice, I moved some wires around.

There are a black and a light green coming out of the US horn.  The black plugs into the "four-plug" that the ignition, killswitch and lighting black wires plug into.

I removed the horn's black plug from the four-plug and plugged in the black coming from the LH control.  I had FTP.  I left the green wire from the horn plugged into the green wire 2-into-1 along with the green wire from the LH control.

I then took the unplugged black wire from the horn and touched it to a bare metal bracket for the wiring, and pressed the horn button.  I had horn!!! 

It seems the black wire from the horn is a ground, and the US and UK bikes had different horn wiring, like you said.  The US LH control only had one green wire that came right out of the horn switch, so I think it was powered by the switch, but now is being powered by the bike and grounded by the switch.

Now, what's the best and safest way to ground that wire, without the threat of fire, shorts, arcing, blown fuses or the like?  Would it be worth it to seek out a UK horn?
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Offline silver fox

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Re: UK 400 Four wiring diagram?
« Reply #6 on: July 11, 2007, 02:34:40 PM »
black and green-horn, orange,blue and white or grey-indicators, black and blue- pass switch, white, black/yellow and blue-high/low switch

Does this make any sense to your loom, just looked on a diagram i got from koyacat products!
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Offline GroovieGhoulie

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Re: UK 400 Four wiring diagram?
« Reply #7 on: July 11, 2007, 03:45:06 PM »
Quote from: silver fox on July 11, 2007, 02:34:40 PM
black and green-horn, orange,blue and white or grey-indicators, black and blue- pass switch, white, black/yellow and blue-high/low switch

Does this make any sense to your loom, just looked on a diagram i got from koyacat products!

Perfect sense.  Got it sorted.  Problem is the Horn is different between the US and UK bikes and now I need to figure out how to properly ground the black wire coming off the horn.
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Offline malcolmgb

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Re: UK 400 Four wiring diagram?
« Reply #8 on: July 12, 2007, 11:25:13 AM »
Mine is a UK bike. The horn has 2 connections on it as you would expect, 1 goes into the loom the other has a ring type connector which grounds to the frame on the horn mounting bolt.
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patspots13

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Re: UK 400 Four wiring diagram?
« Reply #9 on: July 12, 2007, 12:25:44 PM »
check this site out it
 http://oldmanhonda.com/MC/wiring350F.html
it is an animated diagram for a 350 f and a 400 f
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XsTatiC

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Re: UK 400 Four wiring diagram?
« Reply #10 on: July 12, 2007, 02:42:53 PM »
Quote from: patspots13 on July 12, 2007, 12:25:44 PM
check this site out it
 http://oldmanhonda.com/MC/wiring350F.html
it is an animated diagram for a 350 f and a 400 f

That link is fantastic!!!
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Offline GroovieGhoulie

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Re: UK 400 Four wiring diagram?
« Reply #11 on: July 12, 2007, 03:56:29 PM »
Well it's sorted.

I used a wiring diagram e-mailed to me by oldbiker and the advice of malcolmgb.

The wiring harness diagram, (and malcolm), said it ran right to a ground, so I did what malcolm's bike has and ran a small length of wire with a female bullet connector with the black wire plugged into it, and a ring connector on the other side.  Screwed it under the horn mount, right against the frame, and VOILA!!!!

Now I just need to put it all back together, and I'll have the best-charging '76 400F in the US!!!
« Last Edit: July 12, 2007, 03:58:24 PM by GroovieGhoulie »
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patspots13

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Re: UK 400 Four wiring diagram?
« Reply #12 on: July 13, 2007, 12:31:04 PM »
can you e mail me the diagram oldbiker sent to you on my yahoo account   Patspots13@yahoo.com or post in on this thread
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Offline GroovieGhoulie

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Re: UK 400 Four wiring diagram?
« Reply #13 on: July 13, 2007, 03:39:38 PM »
No problem...

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patspots13

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Re: UK 400 Four wiring diagram?
« Reply #14 on: July 16, 2007, 08:04:32 AM »
thank you so much
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