Wiring high-beams to a switch.
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Fail, INC
SL Member
Joined: Oct 2006
Posts: 11,312
From: Forest Park, IL
Okay, so I have Sonars, but I don't wanna wire up the highs through the light stalk since I don't wanna switch off the HID lows when I flash the highs.
So... I was thinking of getting a 3-way switch. On/Off/Momentary
That way, I can have full, independent control of them. Just wondering what my best bet for this would be.
Thoughts?
So... I was thinking of getting a 3-way switch. On/Off/Momentary
That way, I can have full, independent control of them. Just wondering what my best bet for this would be.
Thoughts?
You can do what I did and put in a diode across the low and high leads under the hood. I'm hoping you ran a relay to power your HIDs. If so, run a diode between the high beam lead and the low beam lead into your relay. It will let you use the stalk as an on/off/momentary for your high beams without turning off your lowbeams. The only drawback to this is if you flash your highbeams when the lights are off, the low beams will come on too.
You are almost there then.
I did all my splicing in the adapter harness that came with the Sonars. I cut the low beam lead and ran it to the relay and tapped the high beam and connected them together with a shunt that had a diode in it. Since the power running through the diode will only be turning on the relay, and not carrying the load of the lights a cheap little diode will do the trick. And you still get to use the factory stalk.
I did all my splicing in the adapter harness that came with the Sonars. I cut the low beam lead and ran it to the relay and tapped the high beam and connected them together with a shunt that had a diode in it. Since the power running through the diode will only be turning on the relay, and not carrying the load of the lights a cheap little diode will do the trick. And you still get to use the factory stalk.
Pictures, unfortunately no. It is a bit ugly in there. I plan to make it look better at some point(in the future).
If you need clarification, I could probably whip up a schematic. Let me know.
If you need clarification, I could probably whip up a schematic. Let me know.
The diagram below is what I used. I did all my hacking and splicing in the adapter harness that came with my Sonar projectors. The addition of the diode allows voltage from whichever circuit is on (high or low) to still go to the HIDs. A bonus to this is your factory wired fogs will stay on as well. The only drawback I have found no workaround for as of yet is if you flash your high beams while your lights are off, everything goes on. Thankfully I don't do that too often.
If your high beam comes on with your low, turn them off immediately and turn the diode around.
If your high beam comes on with your low, turn them off immediately and turn the diode around.
Thread Starter
Senior Member



Fail, INC
SL Member
Joined: Oct 2006
Posts: 11,312
From: Forest Park, IL
Dude, I can't thank you enough. That's awesome. As soon as it gets above freezing, I'm gonna play around with it.
Oh, and I already re-grounded my fogs, so I have independent operation of them.
Oh, and I already re-grounded my fogs, so I have independent operation of them.
Thread Starter
Senior Member



Fail, INC
SL Member
Joined: Oct 2006
Posts: 11,312
From: Forest Park, IL
HIDs require a massive voltage spike in order to ignite. This spike can melt the stock wiring harness over time. A relay harness takes the strain off of the stock wiring.
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