PDA

View Full Version : Resistors for LED indicators?

moodyman
04-02-05, 05:35 PM
I've got a set of resistors (25W?) to stop the rapid flashing of the indicators, when I've installed them nothin happens at all, not even a flash.

Now it may just be me being thick, but do they attach 'inline' between the indicator connection and the indicator cable for the bike?

Tried to turn them the other way to see if it makes a differance but to no avail.

All help appreciated as I want to get the bike through the MOT soon and I currently have the choice of rapid flashing or nothing at all :roll:
embee
04-02-05, 05:50 PM
not in series (in-line) with the LEDs.

They should be parallel to the LEDs, i.e. the resistor is connected between the live indicator supply and the earth, and so is the LED. The resistors are not polarity conscious, they can go either way round.
moodyman
04-02-05, 06:23 PM
Sorted :lol:

Cheers mate :oops:
Cloggsy
05-02-05, 10:27 AM
Sorted :lol:

Cheers mate :oops:

#-o Easy mistake to make mate :wink:
BillyC
06-02-05, 09:47 PM
Can you tell me what resistance they are?
Cloggsy
06-02-05, 10:21 PM
Can you tell me what resistance they are?

Written on them is “25W 6 Ω J” :!:

I’ve got a pair of them if you want ‘em :?:
BillyC
07-02-05, 09:18 AM
6 Ohms... is that all!

I'm guessing that I'd need 4 resistors if I were to do all 4 indicators (which is what I want to do). Cheers all the same Cloggsy!

Motrax are pretty crappy... can anyone recommend something with some more quality?
mattSV
07-02-05, 09:30 AM
I fitted 10 watt 10 ohm resistors on my Motrax LEDs. 19p each from Maplins - see here:-

http://www.maplin.co.uk/Module.aspx?ModuleNo=2181&TabID=1&source=15&WorldID=3&doy=7m2
embee
07-02-05, 10:44 PM
in simple numbers, 6 Ohms at 12volts = 2 Amps current and 24 Watts power.
10 Ohms gives 1.2 Amps and 14.4Watts.

You're trying to substitute for a 21Watt bulb (at 12V nominally).

Since the voltage is more like 14V usually the power will be a bit higher than these numbers.

As far as the indicator unit is concerned, either is probably near enough to keep the flash rate correct.

According to the listings, 6.8 Ohms (6R8) is a standard value, so would be quite suitable, but since 10 Ohms seems to work fine that would be a good choice to minimise heating effects.