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08-24-2014, 11:50 AM | #1 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Headlight LED Dimmer
I have a DPDT headlight switch from when I had halogens, to do parallel and series. I now have LED headlights with a dimmer, and I'm gonna wire them up so up is head and tail lights bright, middle is off, and down is dimmed headlights and full tail lights. I sketched something up and it will work, but I hate providing power to my dimmer when it's not dimming. Dimmer has a common +in and +out.
I'm having a mental block. Suggestions? |
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08-24-2014, 02:08 PM | #2 | |
Gone Wild
Join Date: Jul 2010
Location: Peachtree City, Ga.
Posts: 2,759
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Re: Headlight LED Dimmer
Quote:
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08-24-2014, 02:37 PM | #3 |
Gone Wild
Join Date: May 2012
Location: Rio Verde, Az
Posts: 7,170
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Re: Headlight LED Dimmer
I am an EE and I can't read that diagram.
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08-24-2014, 03:17 PM | #4 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Headlight LED Dimmer
All I can say is LED dimmer has a common 12 volt + in and + out, so all three LEDs have 12 volt + all the time (when key switch is on the third position). When DPDT switch is up for high beams, the 12 volt - goes to tail light and both headlights. When DPDT is down, tail lights still get full 12 volts, but headlights are fed from the dimmer. Remember, for a DPDT switch (or any toggle for that matter), when the toggle is up, the lower terminals are in use. Kinda makes sense if you've ever torn one apart.
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08-24-2014, 03:21 PM | #5 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Headlight LED Dimmer
Oops, just noticed my diagram had I and O backwards on the dimmer. Works, but can't think of how to kill power to the dimmer when on high beams, using existing DPDT switch.
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08-24-2014, 03:53 PM | #6 |
Gone Wild
Join Date: Oct 2013
Posts: 413
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Re: Headlight LED Dimmer
Couldn't you mount a toggle switch somewhere on the wire to the dimmer and keep it off except when you think you might be using the lights?
BTW, I like the diagram. :) |
08-24-2014, 04:16 PM | #7 |
Gone Wild
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,329
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Re: Headlight LED Dimmer
It is always a good idea to switch off the positive to all loads.
Try this using what you have: |
08-24-2014, 04:18 PM | #8 |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Headlight LED Dimmer
I already have a DPDT switch on my dash. I had a separate switch for tail lights, but figured if my headlights are on, my tail lights would be too. I moved the dimmer pot to the old tail light switch location. I figure the dimmer pot will be a set it and forget it kinda thing. I was originally gonna keep the pot on the dimmer box, which will be mounted behind the dash, but changed my mind.
I keep my ugly sketches in a folder called "shoulda been". After installation, I do a Visio "asbuilt" drawing. You'll notice all of my wires have industrial number labels. |
08-24-2014, 04:55 PM | #9 |
Guest
Posts: n/a
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Re: Headlight LED Dimmer
wow that is one dirty cup holder
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08-24-2014, 05:28 PM | #10 | |
Gone Mad
Join Date: Oct 2009
Location: Buford, GA
Posts: 8,988
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Re: Headlight LED Dimmer
Quote:
FWIW, All my switches are DP, so up until now, I switched + and -. |
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