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Nov 11th, 2010, 9:22 pm
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#1 (permalink)
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Senior Member
Join Date: Feb 2007
Location: Wanaka, Otago, New Zealand
Posts: 1,544
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Electrical Tech Heads- Help Work This Out.
Got a question for any electrical buffs.
Replacing a front indicator 23w 12 volt front bulb with 10w 12 volt, replacing a rear indicator 23w 12 volt bulb with LED indicator 0.6 w 12 volt LED.
So originally there is 46w on the system, now there is +/- 10.6w so I have a difference of 35.4w.
Can any tell me what size resistor in ohms and watts that I need to balance the system and make it flash normally?
I have limited electrical knowledge hence my ask?
Cheers gents
__________________
Cheers KTiMpostor 
Monstaman
2010 KTM 990 SMR, 6 speed. 
2004 Designa Yello DR650
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Nov 11th, 2010, 10:06 pm
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#2 (permalink)
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Senior Member
Join Date: Mar 2009
Location: Sydney, NSW, Australia
Posts: 487
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What is the current of the LED and the voltage drop.
Subtract that voltage drop from 12 --> aV
R=aV /Current
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Nov 11th, 2010, 10:24 pm
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#3 (permalink)
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Senior Member
Join Date: Mar 2009
Location: Sydney, NSW, Australia
Posts: 487
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Sorry I think I am talking crap.
I fixed this on my old hyper and I had a circuit diagram obtained from this site, but can't find it until I get home.
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Nov 11th, 2010, 10:27 pm
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#4 (permalink)
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Senior Member
Join Date: Aug 2010
Posts: 595
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you just need a $10 load equalizer and all will be fine
comes with most good led kits
Quote:
Originally Posted by Monstaman
Got a question for any electrical buffs.
Replacing a front indicator 23w 12 volt front bulb with 10w 12 volt, replacing a rear indicator 23w 12 volt bulb with LED indicator 0.6 w 12 volt LED.
So originally there is 46w on the system, now there is +/- 10.6w so I have a difference of 35.4w.
Can any tell me what size resistor in ohms and watts that I need to balance the system and make it flash normally?
I have limited electrical knowledge hence my ask?
Cheers gents
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__________________
2010 black 796
dont make me badge you!!
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Nov 11th, 2010, 10:43 pm
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#5 (permalink)
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Senior Member
Join Date: Mar 2009
Location: Sydney, NSW, Australia
Posts: 487
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Resistor is connected across the LED
LED load resistors, wiring diagram
To sink 35W would require a very large resistor.
I think you need to see what is the minimum value required to stabilize rate and buy a ceramic wirewound type 5W type
Start with a 33 -50 Ohm
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Nov 12th, 2010, 1:01 am
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#6 (permalink)
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Senior Member
Join Date: Dec 2008
Location: Wanaka, , New Zealand
Posts: 441
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Quote:
Originally Posted by Monstaman
Got a question for any electrical buffs.
Replacing a front indicator 23w 12 volt front bulb with 10w 12 volt, replacing a rear indicator 23w 12 volt bulb with LED indicator 0.6 w 12 volt LED.
So originally there is 46w on the system, now there is +/- 10.6w so I have a difference of 35.4w.
Can any tell me what size resistor in ohms and watts that I need to balance the system and make it flash normally?
I have limited electrical knowledge hence my ask?
Cheers gents
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Put the two 100ohm 5w resistors in parallel you have like I told you and that may work 
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Nov 12th, 2010, 4:04 am
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#7 (permalink)
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Senior Member
Join Date: Jul 2008
Location: Zurich, , Switzerland
Posts: 121
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Quote:
Originally Posted by Monstaman
Got a question for any electrical buffs.
Replacing a front indicator 23w 12 volt front bulb with 10w 12 volt, replacing a rear indicator 23w 12 volt bulb with LED indicator 0.6 w 12 volt LED.
So originally there is 46w on the system, now there is +/- 10.6w so I have a difference of 35.4w.
Can any tell me what size resistor in ohms and watts that I need to balance the system and make it flash normally?
I have limited electrical knowledge hence my ask?
Cheers gents
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For which bike is it, it's not a Hyper.
Have you looked into this thread Blinker Idicator on Dash Not Working ? There you will find a circuit diagram and an example how to calculate the resistors.
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Nov 12th, 2010, 2:59 pm
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#8 (permalink)
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Senior Member
Join Date: Jan 2010
Location: VERO BEACH, FLORIDA, US
Posts: 376
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23w / 14v = 1642 ma x 2 = 3284 ma or 3.3 amps total stock draw
10w / 14v = 714 ma new front draw
.6w / 14v = 43 ma new rear draw
3284 - (714 + 43) = 2527 ma difference from stock to moded draw
2527 ma x 14 = 35.4 Watts worth of additional resistor
35.4w / 14v = 2500ma
14v / 2500ma = 5.6 ohms worth of resistor
2 - 20 ohm / 20 watt resistors in parallel
will give you 10 ohms at 40 watts
Should be close enough
I think 
You can try 10w resistors as they are easier to find but will get HOT so insulate well.
__________________
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Nov 14th, 2010, 2:03 pm
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#9 (permalink)
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Senior Member
Join Date: Feb 2007
Location: Wanaka, Otago, New Zealand
Posts: 1,544
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Quote:
Originally Posted by Mr Mike
23w / 14v = 1642 ma x 2 = 3284 ma or 3.3 amps total stock draw
10w / 14v = 714 ma new front draw
.6w / 14v = 43 ma new rear draw
3284 - (714 + 43) = 2527 ma difference from stock to moded draw
2527 ma x 14 = 35.4 Watts worth of additional resistor
35.4w / 14v = 2500ma
14v / 2500ma = 5.6 ohms worth of resistor
2 - 20 ohm / 20 watt resistors in parallel
will give you 10 ohms at 40 watts
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That is what I was thinking but the blue ones !!
Couldn't get any 20w resistors, think I will just get some No8 wire or a 4 inch nail.
Got some 5 w to play with but suspect they will end up just looking pretty on the shelf.
__________________
Cheers KTiMpostor
Monstaman
2010 KTM 990 SMR, 6 speed.
2004 Designa Yello DR650
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Nov 14th, 2010, 4:56 pm
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#10 (permalink)
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Extended Member
Join Date: Mar 2006
Location: somewhere between atlanta & n.cali, ITALIA->UK->MI->GA->CA, USA
Posts: 5,352
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i need some electrical tech advice also, so thought I'd add myself to this thread.
Seems like since I unplugged my stock turn signals, that my front and rear lights (but not the passing trigger and not the brake light) intermittently stop working. I replace the 15v fuse and they work for awhile and then burn out.
Had ducshop install my oberon turn signals last week, and both lights went again... replaced the fuse, lights worked for a minute then went again.
any ideas what might be causing this?
__________________
ECM IV is May 8-12th 2013, men in bikinis will wash bikes for free FFS. (And stop yelling or you'll wake up the sleeping asian bitches below)
2008 Ducshop Hyper S a.k.a. "Broke Beak Mountain" in a coma after 2011 ECM crash on Cherohala Skyway (w/ Mag-uhne-sium TA-TAS!),Ducshop engine w/ Pistal pistons, EVO slipper, Ducshop stack, Ducshop light flywheel, Ducshop suspension setup, DP cams, 2-1 termi, PCIII, 1123cc bore, shift-tech alum. subframe, DPseat, DP damper, DP 520chain, Bonamici rearsets, Titax levers, Driven CF handlebar, Rizoma beltcovers/mirrors/grips/reservoirs, tail-tidy, powdercoated parts, carbon-ed everywhere, and Xerox'd
2006 749R -the queen... (none shall touch her)
2005 749S -R.I.P.(homicidal left turning land yacht flyover)
2003 749 -R.I.P.(dog avoidance maneuver)
2003 KTM EXC 450 -(alive and revving despite mind-boggling abuse)
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