2001 Yamaha SR250 - Cafe Racer (Sydney)

[hillsy]

The plate must be mounted horizontally.

 

[Hummingbird]

Yeah, I really want to do this so I asked around about this number plate thing...

It's basically rules vs police leniency.

I've got a mate with a vertical side mount, and cops usually turn a blind eye and just compliment the bike...

Anyway - For registration, I'll put it horizontal. After that, I'll pop it back on the side.


Got a wiring thing that's REALLY bugging me...

Majority of the electrics are wired, heat shrunk, crimped, connected and super tidy. Well, compared to before anyway. Everything works EXCEPT the turn signal indicator! I just can't get that LED to work... So far I've tried wiring the following:
- GREEN & DARK BROWN to either end of the LED
- BROWN WHITE & BLACK (ground) to either end
- BROWN & BLACK - I think that created a short... so don't try this one...

I've ended up shorting the original relay and I've had to buy new ones. I got a 2 pin and a 3 pin relay. I can't get either to work. The 3 pin is for LED's and it kinda works but only one turn signal flashes. Probably will need a higher wattage 3 pin relay. It's like $50 for a stocker...

Somebody's gotta know how to wire this up!

 

[nukem1r]

you should have a signal indicator for left and right.. not just one bulb for both...then you would have a ground option for each.


Mike

 

[Hummingbird]

There's only one LED and it's inside the speedo, which I can't access without damaging the speedo.

When the 'Left' switch is on - Current flows through DARK BROWN and earths out through DARK GREEN.

I assume this is what's happening, especially when I see indicators AND the LED lit up. But it doesn't explain why it won't work the same way when the switch is on 'Right'.

 

[Lupusrex]

There's only one LED and it's inside the speedo, which I can't access without damaging the speedo.

When the 'Left' switch is on - Current flows through DARK BROWN and earths out through DARK GREEN.

I assume this is what's happening, especially when I see indicators AND the LED lit up. But it doesn't explain why it won't work the same way when the switch is on 'Right'.

LED is short for Light Emitting Diode. What a diode does is only letting current flow in one direction. Therefore, it will not light up when it flows the "wrong" way.
If it was me, I'd ground the LED in a conventional way, and then use two conventional diodes, one from each turn signal, and connect them to the + on the LED. That way, the LED will get current from either turn signal lead, but it won't "bleed over" to the other side, and you will have just one LED for both sides.

 

[Hummingbird]

LED is short for Light Emitting Diode. What a diode does is only letting current flow in one direction. Therefore, it will not light up when it flows the "wrong" way.
If it was me, I'd ground the LED in a conventional way, and then use two conventional diodes, one from each turn signal, and connect them to the + on the LED. That way, the LED will get current from either turn signal lead, but it won't "bleed over" to the other side, and you will have just one LED for both sides.

Thanks LR! That really sums it up in English... It never occurred to me LED's only work one way. Makes so much sense now. I thought I had crossed wires!

When the high beams are on, the blue LED glows brighter than the others. So, I'll probably will go ahead with resistors to regulate the brightness. But from what you said, the diodes are a MUST.

The question is what ratings do I need for diodes and resistors??

And running a 2-Pin Relay without a ground wire - Will that work right off the bat or do I need to make changes to the schematic?

 

[hillsy]

Easiest way around your single indicator light problem is to get a 3 pin flasher relay.

Look at this link (it's not the one you want to buy, but it has both 2 and 3 pin schematics in it):

http://www.ebay.com.au/itm/New-Repro-XT500-Round-Flasher-Relay-6V-2-x-23W-QM23B-/300513309488?pt=AU_Motorcycle_Parts_Accessories&hash=item45f7fd3330

The 3rd pin is marked "P" which stands for pilot light.

 

[Lupusrex]

Thanks LR! That really sums it up in English... It never occurred to me LED's only work one way. Makes so much sense now. I thought I had crossed wires!

When the high beams are on, the blue LED glows brighter than the others. So, I'll probably will go ahead with resistors to regulate the brightness. But from what you said, the diodes are a MUST.

The question is what ratings do I need for diodes and resistors??

And running a 2-Pin Relay without a ground wire - Will that work right off the bat or do I need to make changes to the schematic?

Here's a great link for sizing up the resistor you need: http://www.hebeiltd.com.cn/?p=zz.led.resistor.calculator
Just remember that the alternator almost always makes the voltage higher than 12V, so size it up for that.

Regarding diodes, it's just a matter of picking the one with a sufficient enough voltage/amp-rating. Your local electronics supplier should be more than able to answer any questions you'd have about it.

Not sure what you mean about the 2-pin relay. AFAIK, you need to ground the circuits somewhere, or there won't be much action at all.

Other than that, great bike!