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Old 12-05-2009, 03:35 AM   #1
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Default Anyone Done a Quad-Beam Mod?

When I had my Bravada, one of the most popular mods was the "Quad-Beam" mod. That is, when the high beams are turned on, the low beams stay on too. With the Blazer/Bravada/S10 trucks, the lighting system was terrible at best (GM would've been better off using bread ties for the headlamp wiring) so this mod helped high-beam vision enormously.

On my Regency, after switching over to Highbeams, if you hold the flasher back toward you, the low beams will come on.

I was wondering if anyone had done this with their Bonneville... On the *-Series trucks, it only required wiring up a relay and hooking it up to ground, low beam -, low beam + and the high beam +.

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Old 12-05-2009, 08:11 AM   #2
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It'* built in to the headlight control module. It would take a lot of wiring. It'* also, technically illegal to modify the headlights from factory. Not saying you would get pulled over.
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Old 12-05-2009, 09:16 AM   #3
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all you would really need to do is use a coupple of relays and some splices and dontforget fuses

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Old 12-05-2009, 10:13 AM   #4
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2000+ headlights do that except for the GXP. the only ones that shut off when you hit your highs are the fogs on 2000+
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Old 12-05-2009, 03:48 PM   #5
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I'm going to look at the schematic for my Bravada and see if its possible. These lights use the same connectors as my Bravada, so I don't think there would be a problem. I'd just have to find the wiring coming off of the switch and compare the two.

I do understand that headlight modification is illegal (and I think it should be that way, especially kids around here with their purple 15000K HID headlights) and I wouldn't normally do it, but this one is more of a safety lighting mod. And the point of high beams is to increase night vision when nobody is around. I remember speaking to a claims adjuster for AllState who told me about the horrendous act of removing oxidation from your plastic headlights and how its against DOT regulations blah blah blah... Thanks for the heads up, though, Danthurs.

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Old 12-05-2009, 03:57 PM   #6
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you can get the kit to do it from JCWhitney.com shouldn't be more that $20 it'* pretty much just a relay that ya patch in
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Old 12-05-2009, 04:35 PM   #7
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What car are you doing this on?
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Old 12-06-2009, 12:34 AM   #8
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1998 Oldsmobile Regency...

Thanks Sawgunner for the info. I thought they only had "headlight wiring upgrade kits" which draws battery power for the headlights directly from the battery rather than from the switch. I'll have to check it out.

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Old 12-06-2009, 12:41 AM   #9
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ya when ya patch it like that it does regardless of the kit. its the cheapest and easiest way to do it that is why there is a relay and you pull power from the batt the power both pairs of lamps otherwise you will just blow fuses from trying to draw to much power and if you up the fuses then you risk screwing up more than a fuse and then it gets expensive
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Old 12-06-2009, 12:53 AM   #10
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IIRC, this was the mod that I followed from BlazerForum.com

Quote:
How to wire your headlights so the low beams stay on when you have high beams on.

First take the cover off the power terminal block on the drivers side fender should look something like the 1st pic. then locate the wire harness (2nd pic) its kind stuffed under the ABS controller unplug it and you should be able to pull it out from under the bracket to get more room to work on it.
Once you have that unplugged and pulled out find the light green wire and the tan wire strip these are the 2 wires for high and low beams (3rd pic)

When you find the right wires take a stripper and peel back the insulation on them about an inch do not cut right through them it makes it harder to solder.
Using a length of wire strip the end enough so you can wrap it around the tan wire already stripped to solder. Use a spade connector on other end to hook up to relay.
Hook up the tan wire to pin 30 on the relay
Do the same for the light green wire and hook the light green wire to pin 86 on the relay
Take a piece of wire and put a a ring terminal on it and find a good place to ground it I used the bolt the holds the power terminal to the fender. The other end gets a spade terminal and is connected to pin 85 on the relay.
Take your wire with the fuse holder (leave fuse out) on it put a ring terminal on one end and attach it to one of the powered terminal on the power block. Put a spade terminal on the other end and attach it to pin 87 of the relay. Thats it 4 simple wires to hook up and your brights will have a much better light pattern.
Remember to put your fuse back in your fuse holder and your done.

ground to pin 85
fused constant power to pin 87
tan wire (low beam) to pin 30 and
light green wire( high beam) to pin 86
87a no connection
Pic 1:
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Pic 2:
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Pic 3:

Last edited by NTL1991; 12-06-2009 at 01:01 AM.
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