weird electrical problem

[igor]

Hi everyone

I'm experiencing a weird electrical issue

When i try to use the horn , it doesn't work and bring my rpm arrow back to zero each time i try to activate the horn .

Any idea where it can come from ?

thanks for your help

[guzziart]

Sitting here in my recliner.........Maybe a weak ground connection??!!  You could try grounding the horns separately to see if the condition changes to where it doesnt effect the tach function. idk.  I'm sure someone will be along soon to offer other ideas/fixes.

Art

[igor]

  On 3/5/2024 at 11:47 AM, guzziart said:

Sitting here in my recliner.........Maybe a weak ground connection??!!  You could try grounding the horns separately to see if the condition changes to where it doesnt effect the tach function. idk.  I'm sure someone will be along soon to offer other ideas/fixes.

Art

Expand  

thanks . hope someone had the same sort of issue

[docc]

The horn and tachometer get their power through Relay#2. On the early Sport this relay, in turn, gets the power from the weak contact of Relay#1.

If you have not done so already, replace the entire relay set with a "Best" High Current relay from Pickers Components, CIT, (or OMRON if you can find them):

 

Otherwise, check that your battery and charging voltages are adequate...

[Lucky Phil]

  On 3/5/2024 at 2:25 PM, docc said:

The horn and tachometer get their power through Relay#2. On the early Sport this relay, in turn, gets the power from the weak contact of Relay#1.

If you have not done so already, replace the entire relay set with a "Best" High Current relay from Pickers Components, CIT, (or OMRON if you can find them):

 

Otherwise, check that your battery and charging voltages are adequate...

Expand  

Relays, Ignition switch, Connectors, earths, R.I.C.E. The V11 Sport electrical troubleshooting guide.

 

Phil

[docc]

  On 3/5/2024 at 9:21 PM, Lucky Phil said:

Relays, Ignition switch, Connectors, earths, R.I.C.E. The V11 Sport electrical troubleshooting guide.

 

Phil

Expand  

Pretty sure "R.I.C.E" means something else in my line of work.....

What is that in electrical troubleshooting?

[p6x]

@igor

This morning, I read your post, and I thought it was really an odd problem. Nevertheless, as I was running errands, I decided to use my horn.

Instantly, my horn cut off, I lost my tachometer, my head beam, and I later discovered that the low oil pressure lamp was no longer lighting with the engine not running.

I thought that I must be that lucky, someone talks about it, and it immediately affects me.

Fortunately, I checked my fuse box, and discovered that where there should have been a 15 Amps fuse, there was only a 5 Amps one, and it was blown!

I don't think you have the same problem as I did, but just for being thorough, check your fuse....

It is the one with the head lamps icon.

Bonne chance!

[Speedfrog]

  On 3/5/2024 at 9:33 PM, docc said:

Pretty sure "R.I.C.E" means something else in my line of work.....

What is that in electrical troubleshooting?

Expand  

 

  On 3/5/2024 at 9:21 PM, Lucky Phil said:

Relays, Ignition switch, Connectors, Earths, R.I.C.E. The V11 Sport electrical troubleshooting guide.

 

Phil

Expand  

 

[igor]

  On 3/5/2024 at 2:25 PM, docc said:

The horn and tachometer get their power through Relay#2. On the early Sport this relay, in turn, gets the power from the weak contact of Relay#1.

If you have not done so already, replace the entire relay set with a "Best" High Current relay from Pickers Components, CIT, (or OMRON if you can find them):

 

Otherwise, check that your battery and charging voltages are adequate...

Expand  

thanks i'll check that out . i guess you can find the right values for the relay in the manual ?

[p6x]

  On 3/6/2024 at 9:14 AM, igor said:

i guess you can find the right values for the relay in the manual ?

Expand  

Just go by trial and error; substitute the relay with another one which you know works.

[docc]

  On 3/6/2024 at 9:14 AM, igor said:

thanks i'll check that out . i guess you can find the right values for the relay in the manual ?

Expand  

 The manual will be of no use. Open the January 26, 2017 link below and web search for the suggested relays: