Both high and low beams on at same time...? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 03-12-2005, 02:32 AM   #1
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Default Both high and low beams on at same time...?

Does anyone make a wiring kit to keep the low beams on when hitting the highs? Searched the archives and don't see anything for our year cars, although I've seen such a kit for other model.
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Old 03-12-2005, 02:33 AM   #2
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isnt that illegal? i'm not sure
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Old 03-12-2005, 02:35 AM   #3
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I don't think so.

My '72 GrandVille does that.....??
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Old 03-12-2005, 11:59 AM   #4
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The old dual sealed-beams did that. These don't.

I did a mod to keep my fog lights on with the highs, though. Works great and really 'fills the gap'.

You'd have to totally rewire your headlight circuit. A single relay selects between low and high. You'd also need heavier gauge wire and a bigger fuse for the circuit, as the current demand would double.
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Old 03-12-2005, 12:24 PM   #5
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if u hold back the high beam lever both high and lows come on. my car dont and so does my wifes saturn.
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Old 03-12-2005, 05:40 PM   #6
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Quote:
Originally Posted by willwren
The old dual sealed-beams did that. These don't.

I did a mod to keep my fog lights on with the highs, though. Works great and really 'fills the gap'.

You'd have to totally rewire your headlight circuit. A single relay selects between low and high. You'd also need heavier gauge wire and a bigger fuse for the circuit, as the current demand would double.
Well, what you'd need (and places like J.C. Whitney have kits for this) is a relay that'* controlled by your high-beams, which turns on a separate circuit to power your low beams. Thus the low beams will operate as normal using their normal circuit, _plus_ they'll stay on when your high beams activate, via an additional circuit that you wire in.

You can't just jumper your low and high beams together, because then they'll all come on regardless of which circuit is providing the power, plus the electrical load on the circuit will be doubled. So instead, you use a relay that'* controlled by the high-beam circuit, which switches on when the high beams activate. (Switching on the relay takes a neglible amount of power.) The relay in turn controls a new circuit that you install to power the low beams when their usual power feed is not on.

You should have a fuse or circuit breaker on the new circuit that you add. The normal circuit-breaker protection on the existing headlamp wiring will not be affected (the breaker is built into your headlamp switch), and none of the existing wiring will be overloaded.

Although the factory headlamps use a circuit breaker so you're not plunged into permanent darkness at an awkward moment, it'* okay to use a fuse on your new circuit, since blowing that fuse won't affect normal operation of your headlamps otherwise.
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Old 09-04-2009, 12:57 AM   #7
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GM'* new vehicles allow simultaneous hi/low beamed lighting while driving. I would love to find a cheap way to mod mine to do that. I never use my highs because I can see so much better with my lows. Both would be prime.

PS. I'm also putting a wig wag switch to my headlights, Other than for use by municipalities, does anyone know the laws for MAINE (not Oregon, California, Florida... MAINE) regarding wig wags?
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Old 09-04-2009, 01:23 AM   #8
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doesnt the wig wag switch kill the headlight relay because of switching on/off repeatedly?
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