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More Wiring questions

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Lynx:
Hi all,

Three questions today.

I wondered if anyone could identify what these two wires are for coming out of the loom near the horn. I am presuming they are not for the horn and one is the wrong colour. One is black and one green with a yellow stripe. I don't actually have a working horn to test that. Picture attached.

Secondly there is a horizontal mounting bracket the other side of the frame to the horn mount. Is anything supposed to be on there on a 1976 UK bike? Picture attached.

Thirdly I have some spare wires  :-\. Coming off the loom into the main collection under the tank I have two female connectors with nothing connected a Light Blue with a White stripe and an Orange with a White stripe. In the headlight shell I have the same two spare coloured wires and a third one Green with a Red stripe.

All ideas greatfully received.

Cheers
Steve

Lobo:
Hi Steve,

First up, I've been wrong before on these bloody Honda wiring diagrams... seems different countries (can) have different colouring codes / connections.  But here goes...

(1). The Green/Yellow & Black connectors are to the front brake pressure switch under the headlamp.  Touch them together & the rear brake light should come on (with ignition on)

(2) I too am puzzled by this 'bracket'... I genuinely don't think it had a purpose on the UK 400F... certainly I've never seen any picture of it used, despite much searching in a big effort to get my 400F right.

(3) I too have these spare wires; on the American bikes (wiring diagrams) those colours appear to be used for the 'running lights'... you know, they have the orange indicators on all the time, and then also flash for turning. In other words, on a UK Spec machine these wires are superfluous.

Hope this helps,
Simon.

Lynx:
Thanks for the reply Simon. That's not too bad then, accept I don't have the brake pressure switch.! The brake hoses on my bike have been replaced with a single braided steel hose. Does that mean this switch will have been removed?

On a side line, I tried to start the bike for the first time today  :). It fires up but only running on three cylinders  :-\. No.2 down pipe stone cold. There does seem to be a spark on the plug although it's strength seems to vary. I will investigate more a bit later.

Cheers
Steve.

Lobo:
Hi Steve,

Yep, it sounds like your front brake pressure switch is missing...  Dunno, but would the bike pass a MOT without a working front brake switch? (part #233)

(Ignore the blue boxes... just my method of tracking the bits I've renewed on my bike)

Good stuff on the first start, hopefully something small on #2 cylinder.

Simon


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tom400f:
I can confirm Simon's colours for the pressure switch connectors.

Standard brake hose setup has a union in it linking top/bottom hoses and a thread for the pressure switch. Pic here:
http://www.sohc.co.uk/index.php?topic=5325.msg26023#msg26023
(the union that is, the pressure switch is at the top-right of that union as you look there and facing away from you. You can just see the back of the hexagon)

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