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Post by grambo on Apr 25, 2006 12:39:31 GMT -5
I recently replaced my stock turn signals to mini stalk turn signals bought from thumper stuff. He suggested using 1000 ohm resistors on all four flashers. I wired all the resistors into the flashers and now nothing happens when I hit the turn signal. Does anyone know what the problem is and how to fix it.
Thanks.
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Post by sr5ooed on Apr 26, 2006 6:22:26 GMT -5
Did you wire the resistor in series with the bulb? You may have to wire it in parallel. Just a thought.
Ed
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Post by grambo on Apr 26, 2006 8:39:10 GMT -5
I'm not too sure. I soldered the resistors into the power wire from each turn signal.
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Post by sr5ooed on Apr 26, 2006 10:27:11 GMT -5
That would be in series. Maybe he meant parallel, which would be solder one end of the resistor to the power wire and the other end to the ground wire just before the bulb.
Ed
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Post by G Man on Apr 26, 2006 12:35:49 GMT -5
I would not wire the resistor in parallel. You would be grounding your power before the bulb and would stop the light from working. The 1000 ohm resistor might be enough to not blow a fuse, but I doubt it. Also, I understand the recommendation to increase the load on the newer lighter bulbs so they will have enough draw to make the flasher work... I might think that 1000 ohm's may be way excessive though?
G Man
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Post by StewRoss on Apr 27, 2006 2:27:40 GMT -5
Are you able to replace the globes with the same wattage globes as the originals at all?
SR
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Post by wotavidone on Apr 28, 2006 7:16:44 GMT -5
Gents,
I think Stew Ross has given the best advice - put original wattage bulbs in and throw away the resistors.
If you can't do that, then I think I can help with some basic electrical principles here.
First, since I don't know exactly what you have I'll have to assume some basics.
1) Your flashers don't work because you aren't drawing the right current through your flasher can, 2) Your battery is fully charged and 3) you have the original spec flasher can, and 4) YOUR NEW GEAR HAS ORDINARY BULBS, NOT LEDS.
My nice new manual says the flasher can has a capacity of 12V, 27Wx2 + 3W.
That is, the can is intended to run two by 27watt indicator bulbs plus the little 3w bulb in the tacho that tells you that the indicators are operating.
Therefore, you are operating a total 57W. At 14V, which your system should run if it is charging well, 57W is 4.07 amps.
Your new gear must draw the same current to make the can work the same.
This is pretty simple to work out.
THE FOLLOWING IS AN EXAMPLE ONLY!!! I'D NEED TO KNOW EXACTLY WHAT YOU HAVE TO WORK OUT THE EXACT NUMBERS.
Say you new gear runs all 10w Bulbs. You are only drawing enough current for 2 x10 W + 3W, for a total of 23W. That is it would only draw 1.64 Amps. Amps = Watts divided by Volts.
You need to draw enough extra current to represent an extra 34 watts. At 14V you need to draw an extra 2.4 amps. (Watts = Volts X Amps, so Amps = Watts divided by Volts.)
Knowing you have 14V and you want to draw an extra 2.4 amps, you then can calculate that you need a resistor of 5.8 ohms. (Ohms = Volts divided by Amps) This will need to be wired in parallel with one of the indicator bulbs. In practice though, we are talking about a very physically BIG resistor, since it has to dissipate 34 watts of heat. I would get around this by using 2 lower wattage, double the impedance resisitors. With one on each indicator stalk you then balance up the load on the wiring.
If you could let us know what wattage bulbs you actually have in the gear, we could work out some exact values.
Don't forget, if your gear has LEDS in it, we are talking a whole different ball game, and putting a resistor in parallel probably won't do anything for you. Also unless you know the ratings it will be very difficult to figure. (But not impossible.) I'm a little rusty on putting current limiting resistors in series with LEDS, but if it turns out that's what you have, I'll have a go if you want.
Regards,
Mick.
(Wotavidone?)
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Post by wotavidone on Apr 28, 2006 7:25:19 GMT -5
More thoughts on Flashers. If your new gear is drawing too much current, then you need resistors in series. This would be the case if the new gear has bulbs greater than original wattage, they would need current limiting resistors in series just like LEDS.
Really keen to know what you've got now.
Mick
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Post by grambo on Apr 28, 2006 12:14:05 GMT -5
I do not know what the wattage is of the new flashers. I don't know where to look either. First I should try to put new bulbs in with the same wattage as before? So I need four bulbs at 13.5 watts each?
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Post by StewRoss on Apr 28, 2006 17:40:00 GMT -5
Hi,
I just pulled a globe out of the SR's indicators and found that it's 27W.
I thought that the older ones were 32W but I guess not.
27W it is....X 4....
Different wattages will make the indicator units do strange things...one way it'll go quicker the other it will just stay on..as I recall...
I recently put an LED globe into the stop/tail light to see what it looks like...not that good during the day...the normal globe lit up the tail light much brighter generally. The LED globe seems too uni-directional, and only looks bright from straight behind the bike.
SR
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Post by StewRoss on Apr 28, 2006 17:44:36 GMT -5
One other minor thing...I recently fitted some aftermarket indicators that came from Japan (from Deus). Small units and not bad looking. They went straight on and worked perfectly immediately....very bright and not LED... SR  |
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Post by StewRoss on May 8, 2006 6:01:13 GMT -5
How are the indicators?
SR
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Post by grambo on May 8, 2006 7:50:09 GMT -5
Sorry guys I have been pretty busy lately and I haven't had a chance to tinker with the indicators yet. My carb isn't right and I have a tick in the engine so the indicators are the least of my worries. Thank you for all your help everyone.
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