Query approved

I have used the similar 3 terminal cutout ( here shopkeepers called it as cutout & to 4 point / 5 point they call it as relay ) but it won't last long with the load , so i switched to 4 point relay . As i remember the connction of wiring of the cutout is ....
Ground the black wire of horns as you shown in picture . Connect the red wire of horns to cutout H terminal , Connect red wire +12 v from battery to the B terminal of cutout , & connect the black wire from horn button to S terminal of battery . ( in my cutout the S terminal require negative supply so i changed the horn button supply from +ve to -ve )
Though it's been 8 years ago so can't say about your cutout s terminal requirement .

It is good if you add a 5amp fuse in series with horn connecting H terminal & wire .

Bike rpm meter and fuel meter issue

Hello everyone,

My bike's rpm needle and the fuel meter are behaving notoriously.

Let me explain what happens.

When I start my bike everything is fine.

1. I start riding I observe that the fuel meter is showing too much of fuel whereas I am almost near reserve.
2. The rpm needle is fine. But as and when I turn on the headlight or pass light or use horn the rpm needle will turn fully beyond red line and will stay there. Although the real rpm of engine is still as normal 4k or whatever near it. If I switch off the headlight the needle come back to correct level.

I believe there is some fault in wiring. I have got this problem rectified once before also and the SS guy charged 75 rs for this. This has happened again.
I want to know whats the cause of this problem and how to get it rectified properly.

Thanks

Thanks for the explanation. I was confused with the 3-way relay & ended up installing the 4-way relay myself.
With what i could figure out, in a 3-way relay, the body is mounted onto frame directly which grounds itself.
H= horn / other accessories (pin 87 of a 4way relay)
B= Battery source(+12V source)
S=Positive terminal of the switch(horn switch in our case).

The unused ground wire of the horn,can be used to ground the required accessories.

4 pin and 5 pin relay was always better for bikes. and easy too install too.

4 pin relay is better than this 3 pin cutout . The 3 pin cutout i used previously needs no ground from mounting point as there is no connection between the metal cover & internal winding . & it require a -ve from switch as it is of maruti omni , in which -ve supply come from switch to horn while +ve is always present .