Impedance & Wattage specs for resistors to remedy fast blinking LEDs on 620

Started by The ModFather, September 03, 2011, 10:40:55 AM

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The ModFather

2005 S2R 800 Analog Motorcycles Custom Build
2007 Sport Classic 1000S
2008 848 Track Bike
2015 Diavel Dark - Sold
2005 Monster 620 Dark - Sold

OT_Ducati

Trident EL12 variable load flasher, should work plug and play.
no adding resistors. $12.95 at Advanced Auto Parts
99 M750, 94 900sscr, 75 xs650 street tracker

Howie

Quote from: OT_Ducati on September 03, 2011, 05:58:16 PM
Trident EL12 variable load flasher, should work plug and play.
no adding resistors. $12.95 at Advanced Auto Parts

Not without major rewiring on a 620, the flasher is integrated into the instrument cluster.  5 watt resisters should work.

OT_Ducati

99 M750, 94 900sscr, 75 xs650 street tracker

The ModFather

2005 S2R 800 Analog Motorcycles Custom Build
2007 Sport Classic 1000S
2008 848 Track Bike
2015 Diavel Dark - Sold
2005 Monster 620 Dark - Sold

Howie

If you get 5 watt resistors for a 12 volt system the impedance will be good.  Your best bet might be to get the resistors from Rizoma.

Ohmic

The stock turn signal bulbs is 10W. Not sure what your LED pulls. Assume they are ~1W at most.
Thus max (10W-1W) = 9W to have bike flash like stock.

Ohms law... P=VI... V=IR... blah blah blah on a 12V system means it needs to pull .75 amps to simulate stock condition. Thus a 16 ohms resistor will do the thick. Don't go any smaller then that! Depending on the threshold of your flasher-relay might even get away with ~25 ohms. The bigger the resistance the better so you dissipate less heat.

Because this is a 50% duty-cycle single you can use 15W rated device so heat will be at a min.

-Bernard
'It's NOT a Harley... It's a Ducati!'

Bike#1: 2002 Ducati MH900e #1801
Bike#2: 2006 Ducati Monster S2R1000
Bike#3: 2006 Ducati Sport1000
Bike#4: 2008 Ducati HyperMotard 1100

The ModFather

and how would this be wired. In parallel is what I'm hearing. Does that mean one end of the resistor soldered to the positive cable and one end to the ground (black) cable ?
2005 S2R 800 Analog Motorcycles Custom Build
2007 Sport Classic 1000S
2008 848 Track Bike
2015 Diavel Dark - Sold
2005 Monster 620 Dark - Sold

Ohmic

Parallel of course. Remember you want to draw extra current to simulate a stock bulb. So you put your new resistors in parallel to your LEDs. One for each side. Simple as pie.
'It's NOT a Harley... It's a Ducati!'

Bike#1: 2002 Ducati MH900e #1801
Bike#2: 2006 Ducati Monster S2R1000
Bike#3: 2006 Ducati Sport1000
Bike#4: 2008 Ducati HyperMotard 1100

The ModFather

sorry to be a dumbass but I just want to verify one end of the resistor to positive cable the other end to negative cable?
2005 S2R 800 Analog Motorcycles Custom Build
2007 Sport Classic 1000S
2008 848 Track Bike
2015 Diavel Dark - Sold
2005 Monster 620 Dark - Sold

corey

you know, i might have an extra set of resistors that would be plug and play... let me check the garage...
When all the land lays in ruin... And burnination has forsaken the countryside... Only one guy will remain... My money's on...