74 SF2 - relays for high/low beam

[haakeik]

Hi all
I trying to fit one relay for low beam and one relay for high beam.
The low beam relay is ok and working and so do the relay for high beam.
But where do I put the feed to the blue high beam bulb on the speedo?
The wire (high beam) from the headlamp goes to pin 30, signal from switch to pin 85, earth to pin 86, and fused wire from battery to pin 87.
The wire from the blue bulb in speedo goes originally to connector block number 20. I tried to connect this wire to pin 30, pin 87 and pin 85, but no success.
When I switch to high beam, there is no light in the bulb, and yes I have checked that the bulb is ok.

Haakon

 

[laverdakeith]

Feed wire for bulb should be on pin 30. If bulb is ok have you checked for path back to earth from the high beam bulb?



    Keith


   

 

[sfcpiet]

Haakon,

You've got your feeds mixed up, although it doesn't really make much difference in which direction the current passes through the relay...

30 should be your feed from battery or fuse box, 87 should lead to both high beam bulb and high beam warning light.  Make sure the warning light is grounded.  All grounds are connected together within the speedo/tach housing, but do require an external ground from there because of the rubber mounting.

piet

 

[drikko]

Checking the bulb to ground needs to be done but sorry to disagree Piet, but it doesn't really matter which way around you connect to 30 and 87.

To check the bulb works try connecting it to the power feed from the battery and it should light up. If not then the bulb and or wiring to it and ground is faulty.

 

[haakeik]

Feed wire for bulb should be on pin 30. If bulb is ok have you checked for path back to earth from the high beam bulb?


    Keith
   

Thanks Keith, I had a feeling it should be pin 30.

 

[haakeik]

Haakon,

You've got your feeds mixed up, although it doesn't really make much difference in which direction the current passes through the relay...

30 should be your feed from battery or fuse box, 87 should lead to both high beam bulb and high beam warning light.  Make sure the warning light is grounded.  All grounds are connected together within the speedo/tach housing, but do require an external ground from there because of the rubber mounting.

piet

As I recall it, I have only 4 wires from the Speedo, one for the high beam (blue), one for the backlights (red), two for the indicator (black-left indicator/green-right indicator). I may be wrong, but I check that when I'm back home.

Thanks

 

[sfcpiet]

Checking the bulb to ground needs to be done but sorry to disagree Piet, but it doesn't really matter which way around you connect to 30 and 87.

To check the bulb works try connecting it to the power feed from the battery and it should light up. If not then the bulb and or wiring to it and ground is faulty.

You've got your feeds mixed up, although it doesn't really make much difference in which direction the current passes through the relay...

I know, Drikko.

Connection "30" is generally live current feed to any component.  Relays, switches etc are thus marked, as you well know, and it pays to keep things in line when incorporating new components, as I'm sure you also do.  Could otherwise lead to mix ups and short circuits later...

Haakon, should be 5 wires.  Rewired a set of clocks only last week and needed to add the missing ground for exactly the same reason.

piet

 

[drikko]

Yeah sorry piet, I saw the "doesn't matter which way the current flows" after my reply. I have a bad habit of not reading things in full. Probably a result of getting about 400 work emails a day which I skim over for the essential facts only, to respond to.

I tell my sales guys, if it doesn't interest me in the first sentence then I probably won't read past there

 

[haakeik]

Haakon, should be 5 wires.  Rewired a set of clocks only last week and needed to add the missing ground for exactly the same reason.

piet

Really fast responses here. I like

I guess it is safe to wire the ground from the speedo to connector block 24(ground from headlamp) (Back of 24, goes to the - on battery)
Maybe silly question, but I'm not an electric wiz, but a fast learner 8)

Thanks again

 

[haakeik]

When I'm at it

Is the wiring diagram in the green book or Laverdamania for the SF2/3 correct?
On my bike, the wire from top of fuse1 goes to the back of connector block 21,22,23 and not 14 and 15, as in the diagram.
The wire from bottom fuse 1 goes to rear light and the back of connector block 14 and 15, not 21,22,23 as in the diagram.
I'm a little bit confused and will it mess things up?

The bike was running before winter, I haven't yet put the carbs on (cleaning), but's the next thing after all electric is ok again.

In the same diagram it looks like the wire from blue high beam bulb in speedo, via connector block 20 hooks on the wire from the low beam button on the left switch.
I'm even more confused. Or could it be me failing to read electrical diagrams and symbols ???

 

[Tippie]

Hi Haakon
It doesn?t matter which earth the high beam pilot (and other instrument lamps) connects to, as long as it gets to the battery negative (via frame or wire).
I don?t have the green book but the owners manual for my SF2 has wiring diagram for SF1 and numerous things are different.
The same as for the earth, the wire to your high beam indicator lamp (on my bike it actually came on with low beam from new at the factory) can come from anywhere on that high beam circuit. It is just a "spur" wire with a globe that gets power when the circuit (high beam) gets activated. On my bike from new it branched off where the high and low beam wires came from the LH switch to the double connector blocks, with the "spur" running into the harness with all the wires that go to the instruments.
Lee

 

[haakeik]

Haakon, should be 5 wires.  Rewired a set of clocks only last week and needed to add the missing ground for exactly the same reason.

piet

I did what you suggested and guess what, it worked   All my lights is now ok.
I also added LED bulbs for the backlights in both Speedo and Tacho. Much better backlight now. Did not replace the other bulbs, it would be to much light.

Thanks again Piet