single h4 to dual bulbs
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=132057
Printed Date: May 12, 2025 at 9:25 PM
Topic: single h4 to dual bulbs
Posted By: wannabridin
Subject: single h4 to dual bulbs
Date Posted: August 24, 2012 at 12:34 PM
Hello all. I'm working on a motorcycle project currently and I'd like to replace my existing H4 setup with dual LED units. I'd like to wire it up so that one comes on with the low beams and when i switch to the high beams, the 2nd one comes on as well (both on with the high beams).
I don't know quite how to do this. Each LED is a 2 wire setup. Wiring it straight forward with one for low and one for high is easy, but I'd like the above option. Please help!
I'd like to try to keep everything simple and if possible, not add a lot of extra components, as the wiring is hard to hide on this bike. Thanks a bunch!!
Replies:
Posted By: wannabridin
Date Posted: August 24, 2012 at 12:38 PM
These are the bulbs:
https://www.rigidindustries.com/Dually-2x2-LED-Lights-p/duallyled.htm
They're going on a 2001 Spirit 750. Currently have a 55W HID in the stock housing. I don't need a relay for current protection as these only draw ~1 A each! Thanks again.
Posted By: oldspark
Date Posted: August 24, 2012 at 10:50 PM
If both use relays, then a diode from the high-beam relay (coil or output) to the low beam coil.
Or move the low beam circuit to the beam circuit so low is always on, then the hi-lo switch is simply and on-off for the high beam.
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