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Author Topic: dual relay/switch wiring question  (Read 705 times)

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Online CLAY

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dual relay/switch wiring question
« on: March 13, 2017, 07:49:22 PM »
I'm hitting a roadblock so I'm here for the EOE. 

I'm redoing all the electrical accessories on the bike and adding an LED light.  I one I currently have kind of sucks, but it's more proof-of-concept before I get a better one.

I have a set of aux light I have been using for years- they work great.  I have a switch like this that controls them:
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Obviously the switch only works one way.  The aux light I have are aimed for regular running- they light up the road nicely without pissing off other drivers, so I can leave them on all the time at night.  They run on a relay.

I'm adding a 6" LED light bar under the nose with another relay.

What I'd like to do is have it so that when I throw the switch one way I get the driving lights, then when I throw it the other way I get the driving light PLUS the LED light bar. 

How can I do this with two relays and the switch I have?

I've looked at the wiring directly and been drawing diagrams, and doggone it if I can figure it out.  No matter what I do I end up powering both sets of lights with either power from the switch or power from the relay.  I thought about switching the ground, but all of these lights are grounded through the housing and mount.

Any ideas EOE? 


"Most accidents happen when the meek meet the douchebags."  -Viffergyrl
"The wider the road, the worse the food." -Coho

Online CLAY

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Re: dual relay/switch wiring question
« Reply #1 on: March 13, 2017, 07:55:24 PM »
Can I wire the relays in series?
"Most accidents happen when the meek meet the douchebags."  -Viffergyrl
"The wider the road, the worse the food." -Coho

Online CLAY

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Re: dual relay/switch wiring question
« Reply #2 on: March 13, 2017, 08:19:15 PM »
"Most accidents happen when the meek meet the douchebags."  -Viffergyrl
"The wider the road, the worse the food." -Coho

Online SLK50

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Re: dual relay/switch wiring question
« Reply #3 on: March 13, 2017, 09:31:43 PM »
If it was me, I'd replace the SPDT switch with a DPDT.
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Online CLAY

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Re: dual relay/switch wiring question
« Reply #4 on: March 13, 2017, 09:57:00 PM »
Like this?
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Didn't work.  One relay draws the power and clicks- the other doesn't.

Can I do it with three relays?
"Most accidents happen when the meek meet the douchebags."  -Viffergyrl
"The wider the road, the worse the food." -Coho

Online CLAY

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Re: dual relay/switch wiring question
« Reply #5 on: March 13, 2017, 10:26:17 PM »
Added a third relay- and I've got it.  I had the switch already there and the relays in stock.  Golden.   :thumbsup:
"Most accidents happen when the meek meet the douchebags."  -Viffergyrl
"The wider the road, the worse the food." -Coho

Offline Stripes

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dual relay/switch wiring question
« Reply #6 on: March 14, 2017, 06:53:21 AM »
Super! Glad that you fingered it out!
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Offline Max Wedge

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Re: dual relay/switch wiring question
« Reply #7 on: March 14, 2017, 08:25:11 AM »
 3 relays would work. Glad you got it. Fun little problem. Bet you could still do it with two, if you used one relay to power the other.
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Online Cablebandit

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Re: dual relay/switch wiring question
« Reply #8 on: March 14, 2017, 09:00:58 AM »
I think we are seeing why people's bikes catch fire.   :lol:

Online CLAY

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Re: dual relay/switch wiring question
« Reply #9 on: March 14, 2017, 03:30:46 PM »
3 relays would work. Glad you got it. Fun little problem. Bet you could still do it with two, if you used one relay to power the other.

I tried that, but no matter how I laid it out it either wouldn't close both relays or it would back-feed power into the circuit I wanted out.

With three it was cake- I just had to draw it out.
"Most accidents happen when the meek meet the douchebags."  -Viffergyrl
"The wider the road, the worse the food." -Coho