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Old 06-19-2012, 02:54 PM   #1
chevy42083
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Multiple turn signals - parallel/series

I've got two bikes that i plan to add turn signals to, but am unsure of how to wire them.

On bike 1, I'd like to keep the incandescent/oem signals, but wire an LED also.

On bike 2, has LED flushmounts, but I'm adding LED signal mirrors.


Soooo..... series or parallel for each? Can I even mix LED and incandescent on bike 1? I'd like to keep the factory slow flash rate without messing with resistors if possible.

In series, resistance is added up
...this may work for bike 1. But what will happen to voltage?
Will the lights be dim?
Will it blow the LEDs because they have less resistance and therefore draw more of the current?

In parallel, same voltage across all lights
... does this apply even if the resistance is different?
Total resistance is less than the smallest resistance... not the way to keep flash rate low, correct?


Any suggestions? I'm sure someone has done this before.
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Old 06-20-2012, 12:45 PM   #2
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Quote:
Originally Posted by chevy42083 View Post
I've got two bikes that i plan to add turn signals to, but am unsure of how to wire them.

On bike 1, I'd like to keep the incandescent/oem signals, but wire an LED also.

On bike 2, has LED flushmounts, but I'm adding LED signal mirrors.


Soooo..... series or parallel for each?
Bike 1: Not sure it matters with series or parallel. Voltage draw on the LED isnt great enough to really matter.

Bike 2: Parallel if you want to retain the same brightness on each lamp
Quote:
Originally Posted by chevy42083 View Post
Can I even mix LED and incandescent on bike 1?
Yes.
Quote:
Originally Posted by chevy42083 View Post
I'd like to keep the factory slow flash rate without messing with resistors if possible.
You'll be fine. The flash rate changes when you switch from incandescent to LED, not when you add LED on top of it.
Quote:
Originally Posted by chevy42083 View Post
In series, resistance is added up
...this may work for bike 1. But what will happen to voltage?
Will the lights be dim?
Will it blow the LEDs because they have less resistance and therefore draw more of the current?
The voltage draw on the LED is so low I don't really think its going to matter. If you're worried, stick with parallel on Bike 1. Current draw will increase in some absurdly small amount.
Quote:
Originally Posted by chevy42083 View Post
In parallel, same voltage across all lights
... does this apply even if the resistance is different?
Total resistance is less than the smallest resistance... not the way to keep flash rate low, correct?
You're SERIOUSLY over analyzing this.
Quote:
Originally Posted by chevy42083 View Post
Any suggestions? I'm sure someone has done this before.
Yep - and I don't think i'd be stressing this much unless I was wiring up LED headlamps. Adding auxiliary turn signals isn't going to affect your current or voltage in any appreciable amount.
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Old 06-20-2012, 04:23 PM   #3
cuong-nutz
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I'm running incandescant in the rear and leds in the front with a 10 ohm 10 amp rated resistor. I replaced the stock front ones with the leds because I broke the stock and didn't feel like paying full price for replacements. The blink rate is a tad faster than stock but if you want a slower blink rate, bump up the resistance. pos to pos neg to neg.

Seeing how you are adding aux leds, you won't even notice the blink rate change much at all. Maybe .1 millisec slower.
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