Which diode for duel beam headlights - Nissan-Navara.net
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post #1 of 31 (permalink) Old 28-11-18, 11:30 AM Thread Starter
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Which diode for duel beam headlights

Morning guys simple question for the person that knows the answer!
Ive got the aftermarket projector headlights with separate headlight and full beam!
I wasn't overly impressed with the light output so ive upgraded the bulbs to 100w hids and wow what an improvement (its passed 2 mots like this because they are in projector housings so maintains the correct beam pattern )
For safety/overloading reasons ive also rewired them with relays fed from the battery and all works well!
Except when i quickly flash my full beam (ie letting someone pull out) the nissan set up momenteraly turns off the headlights when the full beams are on, and the quick on/off/on/off/on upsets the headlight ballast and they just shut down! Leaving me with no lights at all!
So what im wanting to do is figure out a way of getting the headlights to stay on when i flash my high beam.
Im thinking just connet the output of my full beam relay to the trigger wire of my headlight relay and replace the headlight relay with a slow acting relay to allow for the split second changeover?
But in doing this,it would allow the headlight trigger power from the switch to bleed through to the output side of the fullbeam relay and light up my fullbeams! Unless theres a diode of sorts between them allowing power to only travel from the fullbeams to the headlights and not the otherway around.
Everyone following this? Good cos im struggling to explain it lol
So basically im looking for a link to the right diode i can put inline, bearing in mind its going into an engine bay environment! So would need to be tough and waterproof!

Unless anyone has a better idea?

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post #2 of 31 (permalink) Old 28-11-18, 01:25 PM
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post #3 of 31 (permalink) Old 29-01-19, 08:28 AM
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I would better use a relay in both headlights, that powers low beam when trigger high beam.
On each diode you will lose at least 0.6V (practically even 0.8V) and you will have to dissipate pretty much heat from 5 amps on each diode.

I'm thinking on doing this too, because the high beam alone is kinda bad joke.
Other option for good light at night drive is to open the headlights and install bixenon lens inside, but will have some taughts at anual car inspection.

Last edited by cosmin01; 29-01-19 at 08:32 AM.
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post #4 of 31 (permalink) Old 29-01-19, 09:08 PM
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After market HID's really don't like quick fire on/off. ( A diode won't make any difference)
This looks like your issue to me.

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post #5 of 31 (permalink) Old 31-01-19, 06:43 AM Thread Starter
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Quote:
Originally Posted by diydave View Post
After market HID's really don't like quick fire on/off. ( A diode won't make any difference)
This looks like your issue to me.
https://www.youtube.com/watch?v=55z66zl1_Mo
Yea this is exactly the problem but even doing it slowly it still sometimes does it
I was thinking a diode across the high to the trigger wire of the low beam relay so that when i flash up to high beam the diode would allow the low beams to stay lit up (bearing in mind i have afermarket projectors fitted so seperate bulbs for high and low beam)
Thus killing 2 birds with 1 stone
1 the low beam dont turn off so wouldnt get the ballast fault
2 more light on the road

Black 2008 navara aventura auto
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22" team dynamics, equinox wheels
Halo headlights with hids
Nismo grill
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Android dash radio ,9" dvd headrests
3" stainless cat back exhaust with quad tail pipes

Last edited by gfromleeds; 31-01-19 at 07:23 AM.
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post #6 of 31 (permalink) Old 31-01-19, 07:08 AM
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That diode will just mean the low beams always come on when you are on high beam, so that isn't right.

What would work is that you add in a timer on the low beam circuit that keeps the power on for a second or so when the low beams are switched off. I would suggest a timer relay.
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post #7 of 31 (permalink) Old 31-01-19, 09:03 AM
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It is a legal requirement that low beam stays on with high beam in vehicles with aftermarket HIDs anyhow so whats the issue. However I suspect you may have just converted projector headlights from halogen.

http://www.gov.uk/government/publica...-hid-headlamps

Last edited by popsdosh; 31-01-19 at 09:08 AM.
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post #8 of 31 (permalink) Old 02-02-19, 01:32 PM Thread Starter
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Quote:
Originally Posted by popsdosh View Post
It is a legal requirement that low beam stays on with high beam in vehicles with aftermarket HIDs anyhow so whats the issue. However I suspect you may have just converted projector headlights from halogen.

http://www.gov.uk/government/publica...-hid-headlamps
Correct after market lights
Using 2x h1 halogen bulbs (seperate high+low beam)
But the low beam has a projector unit and ive fitted that with a 100w hid kit

Black 2008 navara aventura auto
Sports hard top
22" team dynamics, equinox wheels
Halo headlights with hids
Nismo grill
Completely de-chromed
Android dash radio ,9" dvd headrests
3" stainless cat back exhaust with quad tail pipes
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post #9 of 31 (permalink) Old 02-02-19, 03:28 PM
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Can you have an an extra pair of LEDs mounted somewhere legal, and just us those to flash other drivers?
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post #10 of 31 (permalink) Old 09-02-19, 03:21 PM
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I used this with my Bi xenon set up.

https://rover.ebay.com/rover/0/0/0?m...2F282730909599

This works my lights fine.

For you you could use the hi beam shield switch to activate your hi beam relay. Probably what I would do to start.

Or you can use the Nissan high beam on the H4 connector to activate the high beam.

Eitherway by using this loom your head lights would always work correctly.
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