Technical - Wiring diagram?

[PegScraper]

Hi all,

 

Does anyone have a copy of the wiring diagram for a CB400 Spec III?

 

I'm asking because I just installed LED turn signals and now as you all know, the blink rate is pretty fast. I'd put a resistor in parallel, but then with 3.4W of power going that way, it gets hot pretty fast.

 

The alternative is to change the blinker from the OEM one to an electronic unit. This should be an easy swap - I think it's in the left side of the bike, under the SpecIII side cover. I am not absolutely sure however!

 

I am thinking of an electronic blinker that will blink regardless of the LED / bulb layout. Where exactly in Sim Lim Towers can I get it? How much will I need to pay? Does anyone in the forum have an extra one I can buy?

 

I'm currently in the east side, and I'd appreciate it if someone could tell me if there is a shop in the east side that sells this kind of stuff. Riding down to Sim Lim Towers in the middle of the day takes a lot of time, and my boss will notice that I'm gone!

 

Any help appreciated. Thanks in advance!

[PegScraper]

This must be the shortest post ever.

 

The wiring diagram is attached. I believe this is the same across all the bikes. Use at your own risk however - more of a reference than a bible.

 

Credit goes to www.oldmanhonda.com [Link]

 

I'm attaching it in case the original is lost. The forum is automatically resizing the image.

[TitanicLexus]

I tink u face the same problem as me b4.... go here n read, hope it help...

 

http://www.singaporebikes.com/forums/showthread.php?t=206032

 

I din added any signal relays to slow down the blinking time...

[PegScraper]

I tink u face the same problem as me b4.... go here n read, hope it help...

 

http://www.singaporebikes.com/forums/showthread.php?t=206032

 

I din added any signal relays to slow down the blinking time...

 

From your topic, I see that it was either a parallel resistance or changing the wiring up front. In either case, I'm risking the quality of the electric system. With the resistors, it's a fire hazard, and with shorting two different wires, I'm just playing with things I do not understand. With swapping the blinker relay, I can always swap it back in case it doesn't work out without any risk to the bike.

[joajas]

you can swap out the blinker to one that is non load sensitive.

 

The resistor should be wired in series with the +12v line of the led.

 

Resistors exist in different power rating also, try getting those ceramic 3W or 5W ones. They don't get so hot easily.

 

Normal ones are usually 1/4W or 1/2W only.

 

One way to find the blinker is to turn on the signal lights and follow the sound.

[TitanicLexus]

you can swap out the blinker to one that is non load sensitive.

 

The resistor should be wired in series with the +12v line of the led.

 

Resistors exist in different power rating also, try getting those ceramic 3W or 5W ones. They don't get so hot easily.

 

Normal ones are usually 1/4W or 1/2W only.

 

One way to find the blinker is to turn on the signal lights and follow the sound.

 

WOW.... bro, i hope i can do tat, but i really no experience in this area.... Can help?

[PegScraper]

you can swap out the blinker to one that is non load sensitive.

 

I just got one from Ideal Motorsport in Kaki Bukit (because it's pretty close, and I don't have the time to go to Sim Lim Towers before they close). I'll swap my blinker out for this new one and report on how it went.

 

The resistor should be wired in series with the +12v line of the led.

 

Don't you mean in parallel? Because then the voltage drop across the LED turn signal is changed, and is whatever is left over after the resistor in front of it. I believe that will make the LED turn signal less bright. If it is in parallel, the resistor+LED will take the 3.4W of energy required, while both of them get the 12-13V of voltage drop across them.

 

One way to find the blinker is to turn on the signal lights and follow the sound.

 

That is an excellent idea. Though I think I've located the unit yesterday on the left hand side of the bike. Will confirm today. I've just taken an A3 print-out of the wiring diagram so that I can ascertain it.

[joajas]

I just got one from Ideal Motorsport in Kaki Bukit (because it's pretty close, and I don't have the time to go to Sim Lim Towers before they close). I'll swap my blinker out for this new one and report on how it went.

 

 

 

Don't you mean in parallel? Because then the voltage drop across the LED turn signal is changed, and is whatever is left over after the resistor in front of it. I believe that will make the LED turn signal less bright. If it is in parallel, the resistor+LED will take the 3.4W of energy required, while both of them get the 12-13V of voltage drop across them.

 

 

 

That is an excellent idea. Though I think I've located the unit yesterday on the left hand side of the bike. Will confirm today. I've just taken an A3 print-out of the wiring diagram so that I can ascertain it.

 

 

Your led signal is designed for 12v. It should drop a total of about 12v. By placing your resistor parallel with the led, the voltage drop remains the same, but resistance value in the circuit will be nearest to the branch with the lowest resistance.

 

V=IR

P=IV

 

Let's say our usual signal bulb draws 15W. "I" will be 15W/12V = 1.25A.

 

Let's say the led drop 12V. To make them blink at the same rate as the light bulb without changing the blinker/condenser, you will need 12V/1.25A = 9.6 Ohm

 

So you will need to resistors to be in series to increase the total resistance in the circuit. By placing them in parallel to the led, the resistance will still be about the same as without the resistor in the circuit.

 

Electrical gurus please verify if my theory is correct. Thanks

[PegScraper]

So you will need to resistors to be in series to increase the total resistance in the circuit. By placing them in parallel to the led, the resistance will still be about the same as without the resistor in the circuit.

 

Electrical gurus please verify if my theory is correct. Thanks

 

I'm not sure I understand though - by serializing you are reducing the voltage across the LEDs. When you parallelize the resistor, you need to pick quite high a resistance to make do.

 

In other news, my new transistor based blinker works with my LED blinkers perfectiy. My pet project over the December holidays is to make a new LED pole light + blinker combination. Wish me luck!

[joajas]

I'm not sure I understand though - by serializing you are reducing the voltage across the LEDs. When you parallelize the resistor, you need to pick quite high a resistance to make do.

 

In other news, my new transistor based blinker works with my LED blinkers perfectiy. My pet project over the December holidays is to make a new LED pole light + blinker combination. Wish me luck!

 

You are right by saying that serializing you are reducing voltage across led, but when you try to put them in parallel, you will need a really high resistance one, by calculation it will not be really practical.

 

You have actually done the correct way of using a proper blinker. But it is still best to confirmed that you have resistors in the signal's design to protect it from over loaded with current.

 

By the way what leds are the signal light using? 5mm or superflux?

 

Good luck to your upcoming project.

[joajas]

repeated post

[PegScraper]

You have actually done the correct way of using a proper blinker. But it is still best to confirmed that you have resistors in the signal's design to protect it from over loaded with current.

That I agree with. Will need to read up more about this before I make my new LED signal.

 

By the way what leds are the signal light using? 5mm or superflux?

5 mm LEDs. To kick off the project I got a pair of (the biggest) LED turn signals from Regina. They however pale in size with the OEM signals. The OEM signals are damn heavy when you get them off. At least 3 times as heavy as the LEDs that went on! More power to weight ratio!

 

Good luck to your upcoming project.

Thanks - will try to take pictures and document it.