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**abhichotu.abhi** · 07-15-2009, 08:11 PM

Originally posted by pavanchirmade View Post

Dude when we install two horns we install a relay so that the current drawn by both the horns together doesn't burn the stock switch due to overcurrent. The stock switch was designed to handle current taken by just one horn. But when you want to install 2 horns, the current drawn by both of them may exceed the max current ratings of the stock switch. To save the switch, we use a relay. The relay doesn't regulate or anything. Its just a switch. The current required for the double horn for eg will be supplied by the battery. There is no way that the horns would sound just right even if their current requirement exceeds the battery capacity by just installing a relay.

A relay on being energized, just completes the load circuit. As soon as it is de energized, the circuit breaks.
This is the sole purpose of a relay.

again you have got it slightly wrong

looks like i have to use my whole knoweldge of engineering to make you understand. please install 2 horns without relays and use seperate high rating switch now for this time you will know what am i trying to make you understand relays are multipurpose.

**pavanchirmade** · 07-15-2009, 08:22 PM

I have installed 100/90watt bulbs in my car, earlier i had run them on stock wiring and the switch controlling headlighs burnt right in front of me giving white smoke. After that i had modified the wiring temporarily and had used a 20A capable switch. The headlights glowed very bright. Now I have got the burnt switch changed and installed a 2 relays in the circuit. The circuit goes like this.The output of the new low rated switch activates the relay and the relay turns the headlights ON

And guess what: The headlights glow at exactly the same intensity without the battery or the switches or the wiring or even the bulbs conking off.
The bulbs glowed the same with a 20A switch and with relays. My car had 65watt bulbs originally. So according to your theory, it wouldnt have supported the bulbs to glow properly if relays weren't used. But there was no difference in the brightness of the headlights with or without the relay. The relay just saves the expensive headlight switch in the car.

**pavanchirmade** · 07-15-2009, 08:23 PM

Originally posted by abhichotu.abhi View Post

again you have got it slightly wrong

looks like i have to use my whole knoweldge of engineering to make you understand. please install 2 horns without relays and use seperate high rating switch now for this time you will know what am i trying to make you understand relays are multipurpose.

OT:
So are you an electrical/ electronics engineer?

**abhichotu.abhi** · 07-15-2009, 08:35 PM

Originally posted by pavanchirmade View Post

I have installed 100/90watt bulbs in my car, earlier i had run them on stock wiring and the switch controlling headlighs burnt right in front of me giving white smoke. After that i had modified the wiring temporarily and had used a 20A capable switch. The headlights glowed very bright. Now I have got the burnt switch changed and installed a 2 relays in the circuit. The circuit goes like this.The output of the new low rated switch activates the relay and the relay turns the headlights ON

And guess what: The headlights glow at exactly the same intensity without the battery or the switches or the wiring or even the bulbs conking off.
The bulbs glowed the same with a 20A switch and with relays. My car had 65watt bulbs originally. So according to your theory, it wouldnt have supported the bulbs to glow properly if relays weren't used. But there was no difference in the brightness of the headlights with or without the relay. The relay just saves the expensive headlight switch in the car.

OK... the power extracted by bulbs say 100W that you are using, now the point is if you use relay it will regulate automatically the rated power of your new bulbs. I own a tata safari and had installed headlight relay kit in
it and i felt the difference. but i am not sure what is happening in your case. which ampere relay you used
i think to prove that relay does boost i have to do practical for you on webcam...hehehe..now have you tried same thing
after all which car do you own and from where you are.

please try the same thing with horns you will know why i am correct. becuz in case of horns the sound would straightly minimise if you press horn button for long time without relay please experience it. i donot know that why you are not accepting relay also boost...

**abhichotu.abhi** · 07-15-2009, 08:35 PM

Originally posted by pavanchirmade View Post

OT:
So are you an electrical/ electronics engineer?

yes final year is going on..

**pavanchirmade** · 07-15-2009, 08:43 PM

I am using 2x 12V 20A relays. I have run both the setups[20A switch and 20A relays] for quite a long time and long night drives. I have a 2002 Alto Vxi 1.1. But how has that got to do anything with the kind of car I drive?
I am not accepting just because it is not at all true.

A relay will supply only available quantity of power to the load upon activation. If you open up a relay, you'll notice that the coil is not at all connected to the load terminals. The coil is just a bloody electromagnet used to actuate the armature. Open up a relay without breaking it and you'll know about whatever I've been talking about there.

**abhichotu.abhi** · 07-15-2009, 08:46 PM

Originally posted by pavanchirmade View Post

I am using 2x 12V 20A relays. I have run both the setups[20A switch and 20A relays] for quite a long time and long night drives. I have a 2002 Alto Vxi 1.1. But how has that got to do anything with the kind of car I drive?
I am not accepting just because it is not at all true.

A relay will supply only available quantity of power to the load upon activation. If you open up a relay, you'll notice that the coil is not at all connected to the load terminals. The coil is just a bloody electromagnet used to actuate the armature. Open up a relay without breaking it and you'll know about whatever I've been talking about there.

no i was just asking for sake of information(car) it has nothing to do with relays and all those thingis. about relays it matters on applications the internal circuitary is designed according to requirements.

and opening a relay and examining is what i have done because of my field.
i have used 40A relays in my headlight

**abhichotu.abhi** · 07-15-2009, 08:49 PM

40 A relay for low... and 20A for high... as my car has four lights 2 for low and two for high

**pavanchirmade** · 07-15-2009, 08:49 PM

Originally posted by abhichotu.abhi View Post

OK... the power extracted by bulbs say 100W that you are using, now the point is if you use relay it will regulate automatically the rated power of your new bulbs. I own a tata safari and had installed headlight relay kit in
it and i felt the difference. but i am not sure what is happening in your case. which ampere relay you used
i think to prove that relay does boost i have to do practical for you on webcam...hehehe..now have you tried same thing
after all which car do you own and from where you are.

please try the same thing with horns you will know why i am correct. becuz in case of horns the sound would straightly minimise if you press horn button for long time without relay please experience it. i donot know that why you are not accepting relay also boost...

This happens because the stock switch cannot carry enough current required for both the horns. That is why they sound feeble. When you use a relay of proper rating in the circuit, the horn can draw the exact amount of power it requires as the relay can withstand higher currents flowing through its load points.That is why you experience horns sounding louder with relays.

**abhichotu.abhi** · 07-15-2009, 08:53 PM

Originally posted by pavanchirmade View Post

This happens because the stock switch cannot carry enough current required for both the horns. That is why they sound feeble. When you use a relay of proper rating in the circuit, the horn can draw the exact amount of power it requires as the relay can withstand higher currents flowing through its load points.That is why you experience horns sounding louder with relays.

i am not talking about horns sounding louder but i am talking about horns sounding louder for longer time if you keep switch pressed for say 20 seconds.

well pavan i am sorry but i cannot keep up with you,simple reason i have given my 100%.sorry pavan we have to stop here.. as there will be no ending of this issue.. but regarding my knoweldge about relays boosting voltage levels is correct i can surely say that

**pavanchirmade** · 07-15-2009, 09:07 PM

Alright, relay as a switch works for me. Relay as a current/voltage booster works for you. peace.

**rahuldevnath** · 07-16-2009, 12:42 AM

Originally posted by abhichotu.abhi View Post

i am not talking about horns sounding louder but i am talking about horns sounding louder for longer time if you keep switch pressed for say 20 seconds.

well pavan i am sorry but i cannot keep up with you,simple reason i have given my 100%.sorry pavan we have to stop here.. as there will be no ending of this issue.. but regarding my knoweldge about relays boosting voltage levels is correct i can surely say that

Relays as whats known simply by the term "Relay" is purely used for opening/closing of a circuit. Can you provide the principal behind the relay working as booster? What are Step-Up trasformers in that case and then why do we use Trasformers in AVRs?

**nikhilym55** · 07-16-2009, 10:04 AM

To Abhi,

In simple words, relay is something like doorbell.In doorbell when we complete one circuit d other starts workin n bell rings.In d same way when we trigger relay ,d electromagnet in relay gets activated n other ckt gets shorten so dat headlamp glows....but in d case of relay triggering voltage or current need not to b d same as we get in d output...i think this will clear dat relay doesnt boost up current or voltage...but it works like an indirect switch

**neelesh** · 08-03-2009, 02:11 PM

GS150r Horn

HI
got a suzuki gs150 r which runs on a 9ah battery, i need to install windtone horns as repalcement for stock horns,the windone consumes 5amp*2= 10amps , do i need a cutout and who is the person in banglore who will do the same for me please help

**abhijeet080808** · 08-03-2009, 02:17 PM

^^ A relay is definitely needed. But a load of 120W (12V x 10A) will drain the battery very easily. I suggest that you use some other horns which consume less power.

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