Author Topic: Honda CB550 1975 usa spec running lights  (Read 370 times)

Offline Ibby4585

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Honda CB550 1975 usa spec running lights
« on: November 01, 2020, 03:52:45 PM »
Hi.

I am sorting all the wiring out on my usa spec cb550, I've rewired the indicators and when I tried them they remain on with the headlight. I've removed the blue/white and orange/white wires and the indicators perform as normal and remain off, but the headlight remains on all the time, how can I stop this please?

Cheers
Kris

Offline Erny

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Re: Honda CB550 1975 usa spec running lights
« Reply #1 on: November 01, 2020, 04:08:58 PM »
What type of r/h swith you have? Is there headlight switch on/off? Stock usa model has it (as mine)

If you have it, it does not have any effect?
CB750K7 US model (1977)
CB550K1 US model (1975)

Offline Erny

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Re: Honda CB550 1975 usa spec running lights
« Reply #2 on: November 01, 2020, 04:11:23 PM »
It should look like this
CB750K7 US model (1977)
CB550K1 US model (1975)

Offline Ibby4585

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Re: Honda CB550 1975 usa spec running lights
« Reply #3 on: November 01, 2020, 04:13:45 PM »
I have that switch, well its a remade one from Germany , but it has no effect of the front headlight in the off or on position. Everything else ie tail light and speedo switches turn off an and on.

Online SteveW

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Re: Honda CB550 1975 usa spec running lights
« Reply #4 on: November 01, 2020, 04:13:53 PM »
It should look like this

That’s exactly what my 74 550 USA spec is like
1974 CB550 K0
2000 CBR929RR Fireblade
1966 Lambretta LI150 Series 3
1981 RD350LC
1972 Raleigh Chopper
1974 Raleigh Tomahawk
2011 Henry Hoover

Offline Ibby4585

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Re: Honda CB550 1975 usa spec running lights
« Reply #5 on: November 01, 2020, 04:17:35 PM »
Is there anyway you can remove the headlight on all the time feature?

Offline Erny

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Re: Honda CB550 1975 usa spec running lights
« Reply #6 on: November 01, 2020, 04:35:26 PM »
I have that switch, well its a remade one from Germany , but it has no effect of the front headlight in the off or on position. Everything else ie tail light and speedo switches turn off an and on.
Then you some something connected wrong. With that original switch you swith headlight on/off manually. If you keep switch in On position, you have it like automatic, headlight goes on/off with ignition.

I advice you to take proper schematic diagram for your USA model and check wiring in headlight, I expect there is something modified
CB750K7 US model (1977)
CB550K1 US model (1975)

Offline Bryanj

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Re: Honda CB550 1975 usa spec running lights
« Reply #7 on: November 01, 2020, 04:52:37 PM »
Aftermarket switches tend to have the wrong wiring colours so you need to sort out what happens with a multimeter ad diagram

Offline Ibby4585

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Re: Honda CB550 1975 usa spec running lights
« Reply #8 on: November 01, 2020, 05:01:35 PM »
OK, cheers guys will have another good look in there tomorrow. Good news is that I've got power and the engine turns over with the oil light going out.

So I'm getting closer.

The bike hasn't run since the 80s, so I'm thinking I'm quite lucky

Offline Erny

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Re: Honda CB550 1975 usa spec running lights
« Reply #9 on: November 01, 2020, 07:36:47 PM »
just in case you don't have it - here is diagram of my 550 K1 USA spec. Scan of diagram from user's manual.
Scan is high resolution, you can zoom for detail
CB750K7 US model (1977)
CB550K1 US model (1975)

Offline Ibby4585

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Re: Honda CB550 1975 usa spec running lights
« Reply #10 on: November 01, 2020, 09:12:45 PM »
Brilliant cheers.


What is the clutch microswitch for please?

Kris

Offline Erny

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Re: Honda CB550 1975 usa spec running lights
« Reply #11 on: November 01, 2020, 09:19:50 PM »
it blocks starter - if you don't have engaged neutral and you won't push clutch (microswitch in lever base) starter won't turn.

I strongly advice you to donwload Honda Service manual from Aladdin's Cave here : http://info.sohc.co.uk/download/cb500-550-shop-manual/

There is all described (except some typos there, this is a bible you need. Forget Clymer, Haynes etc!)
CB750K7 US model (1977)
CB550K1 US model (1975)

Offline mike the bike

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Re: Honda CB550 1975 usa spec running lights
« Reply #12 on: November 01, 2020, 09:26:43 PM »
The starter solenoid earth's either through the neutral switch or the clutch switch.   So if the bike's in gear with the clutch not pulled in, the starter won't operate.
Where's that 10mm socket got to?

Offline Ibby4585

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Re: Honda CB550 1975 usa spec running lights
« Reply #13 on: November 01, 2020, 10:47:23 PM »
Cheers Erny.

Offline Bryanj

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Re: Honda CB550 1975 usa spec running lights
« Reply #14 on: November 02, 2020, 08:45:31 AM »
Sorry Mike only the early one earth, the safety circuit ones power via the button and the clutch switch does something fancy with the diode. On a lot of the US ones the starter button has 3 wires, 1 power in(black), 1 power to solenoid when pushed(green/red OR yellow/red), 3 power to headlight when button NOT pushed(black/red i think), as headlamp comes on with key this turns it off when starter current needed.
I spent about a month doing long distance diagnostics with a member on US site who had bought aftermarket switches that "fit straight on" according to the big US supplier but the colours were all wrong and trying to do a 10 min multimeter test by email dont half get long and laborious

 

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