gsxr750 h 87 indicators electrics guru wntd

[mogiman]

Hello Ladies and Gents and the rest of yas ;)
my prob is I brought some mini carbon look indicators on tardme
my bike is 12v my original bulbs are 12v 21w
when i put the new indicators on they all turn on and stay on and dont flash
the bulbs have no markings but i expect they are between 2.5 v and 5 v ,i was thinking of putting a resistor or resistors to drop the voltage so these will work, after getting someone to test the bulbs they are running at 80 omhs cold ,can anyone tell what resistor-s i would need to use i dont have a manual and cant seem to find any info online about the electrics
after testing these at 12v they are about twice as bright as my normal ones so i dont see a prob with using these at a lower voltage
Or has anyone solved this any other way???
they are not legal as they dont have the safety standard markings but i will change to my originals for wof time.But i really want to use them as they look soooooooo nice on the bike
thanks in advance

[gammaguy]

if they dont flash its because you have too much resistance.

try lower wattage bulbs for a start.:calm:

[mogiman]

if they dont flash its because you have too much resistance.

try lower wattage bulbs for a start.:calm:


THE NEW indicator are lower wattage
original bulbs 12v 21w old indicators
new bulb 5w new indicators
my logic say that the reason they stay on is that even a small amount of voltage keeps them on as they are always live when the bike is turned on its only the relay that switches it on and off and if there was to much resistance they wouldnt even go because the voltage wouldnt be enough or voltage loss would be to much
can you explain more

[hmmmnz]

p=vi so p/v=i or (p=v²/r or r= v²/p)
old was 21w/12v = 1.75a
new im assuming they are about 5w cheepo indicators
5w/12v=0.41a
if you lower the wattage you also lower the current draw,
most (not all) indicator relays require a certain amount of current (amps) to heat the bi-metal strip inside the relay to bend it away from the contacts, when it breaks that contact it starts to cools down and touches the contact again, which in turn heats it back up and in turn breaks the contact,

so assuming your new indicators are 5w they will have a resistance of
v=i.r
we know v=12v i from before was 0.41
so v/i=r 12/0.41=28ohms

you old one was 12/1.75= 6.8ohms

what you really have to do is buy a solid state indicator relay
dunno where you get them from in new zealand, i used to get them from wemoto in the uk for a few quid

actually here you go http://www.ledstuff.co.nz/product_info.php?products_id=104&osCsid=69c9982bde13895c8dcd78ea94a07fe4 $20 and good for up to 20a

[toebug]

You could probably even get them from your local bike shop. The ones we wire in dont look like what hmmmnz is pointing at but they cost like $4 per indicator and just an inline resistor.

[hmmmnz]

i prefer to change the relay, the solid state ones will work with 21w indicators or
led indicators, the only down side is, that your indicators dont flash really fast when you blow a bulb, :D so you never no a bulbs gone :D

[mogiman]

thanks for the input + rep for both the led way seems like a lot more work so might try the inline resistor way first easier and cheaper and if that dont work ill try the led way
anymore ideas, by anyone, I would still like to see as it may help others in the same boat .
thanks

[hmmmnz]

lol, its easy as pie, pull the old relay out put the new one in,
it doesnt get any easier :D

[jonbuoy]

You'll need some high wattage resistors - even then they'll get toasty warm I seem to remember seeing flasher relays in supercheap auto - worth a look.

[Squiggles]

You'll need some high wattage resistors - even then they'll get toasty warm I seem to remember seeing flasher relays in supercheap auto - worth a look.

Its about 25 bucks for a non load sensitive flasher relay from repco/supercheap, perfect for led indicators...