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  #1  
Old 7th May 2018
InjunMike InjunMike is offline
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Default Add resistor to turn signal circuit?

Hi,

I mounted 4 of those bullet-style mini lights for turn signals on my '92 xl.

Come to find out the mini-bulbs are low wattage (10W) and won't blink. When I put regular 1156's (20W) in the rear, they blink fine. 1157's do the same thing in the front.

Problem is, the mini lights lens cover won't fit over the 1156's or 1157's.

Question: can I add a resistor to the circuit to make up the wattage? I figure a 15 ohm resistor would provide another 10 watts.

Sound good? Any other ideas? Is there higher-wattage mini bulb? I really don't want to change out the signals again.
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Old 7th May 2018
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Hi bud I had the same issue on my 03, I used 10ohm resistors came from Autozone and tucked them under the seat near the turn signal module one for each side and she works fine


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Old 7th May 2018
InjunMike InjunMike is offline
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Awesome! Thanks...gotta go to Autozone.
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Old 7th May 2018
InjunMike InjunMike is offline
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Dude, are these what you're talking about?

https://www.autozone.com/electrical-...-and-resistors
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Old 7th May 2018
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These are the typical resistors added for load balancing:

https://www.amazon.com/dp/B079K7LGV2


Read over this Sportsterpedia section on Turn Signals:
http://sportsterpedia.com/doku.php/t...ignal_function

Look at the TSM diagram for the 1991-1993 models - Notice the labeled connections - You have:

1) Black ........... Ground For The TSM
2) Orange ......... Power For The TSM From Accessory Circuit
3) White/Green .. Input From Speedo to Cancel Blinking
4) Brown .......... Output to Right Side (Front & Rear) TS Housings/Bulbs
5) ----- blank ---
6) Violet ........... Output to Left Side (Front & Rear) TS Housings/Bulbs
7) ----- blank ---
8) White/Brown .. Input Signal From Right TS Switch
9) ----- blank ---
10) White/Violet . Input Signal From Left TS Switch

The TSM functions by using current load to cause the flashing - therefore, in order to flash, the bulbs must draw enough current to make it function - or you need to add resistors to pull enough current to make it flash...

Typically, if replacing bulbs with LEDs, you need one resistor (6-ohm, 50-watt) for each bulb you change to LED - If you only change out one bulb, only one resisitor is needed - if you change out both front & rear on a side, you need two resistors ON THAT SIDE to make the TSM work correctly - So, changing all four bulbs requires two resistors added on each side, making a total of 4 resistors...

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Old 7th May 2018
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Just one note to add to IXL2Relax's comprehensive post:
Ideally the total load is 6 ohms per position.
That is the resistance of the 1157 high element.

With LEDs, a 6 ohm resistor is ideal.

With a different incandescent bulb, If you want a perfect match, measure the resistance and, if you can, purchase a resistor to add up to 6 ohms total load per position.
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Old 7th May 2018
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is this only required if adding led turn signals?
I have a led headlight and put in a led tail light bulb - no resistors and everything works fine. (at least so far) thx
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Quote:
Originally Posted by robistro View Post
is this only required if adding led turn signals?
I have a led headlight and put in a led tail light bulb - no resistors and everything works fine. (at least so far) thx
The resistor being added has nothing to do directly with the bulbs - but rather is a requirement for the Turn Signal Module to work properly because other bulbs do not draw enough current load for the TSM to flash...

Resistors are not required for extra load related to any bulb that is not controlled by the Turn Signal Module...

So - NO - No resistor when changing the headlight or taillight...

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Old 9th May 2018
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Quote:
Originally Posted by InjunMike View Post
Dude, are these what you're talking about?



https://www.autozone.com/electrical-...-and-resistors


Yep the sylvania loaf equilizers about 20 bucks


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Old 15th May 2018
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this is a simple fix with a single circuit, i made two for less than 20 bucks. it does not require soldering or splicing the harness. it will handle the entire system including 4 way function.
will post the circuit later, on road trip and using this small screen is the pits!

http://xlforum.net/forums/showthread.php?t=1863262
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