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Old 03-01-2021, 09:47 PM   #1
Becauseracecar
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Default headlight/DRL wiring questions with adding aftermarket lights

So I picked up a 98 SL1 recently to become my new daily, I live out in the middle of BFE with alot of deer population, so I decided to add a little light bar to the front of the car. I've done this on some previous cars, and normally I use a 4 pin relay (power to relay from battery, ground to relay, power out to accessory lightbar, and then a trigger 12v from a switch) in which I use 12v+ from my brights so my bright switch is the trigger for the relay. I ONLY use the brights when there's absolutely no one else around, and I've found having the lightbar on the bright switch is much faster at being able to turn off/on than adding a secondary switch that I have to flip. Now fast forward to yesterday when I went to hook up the relay for the lightbar to find out that saturn does some weird DRL wiring etc and the circuit isnt as simple as a positive and negative to the headlights. Is there anywhere easy to pull 12v ONLY when the brights are on, that doesnt have a underlying current to it when they're off? Am I missing something simple here? Thanks



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Old 03-01-2021, 10:02 PM   #2
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Default Re: headlight/DRL wiring questions with adding aftermarket lights

You might be able to use the high beam indicator bulb in the cluster as a 12v switch. It would be kind of a hassle to run a wire from under the dash to wherever your light bar is, but it would completely bypass the DRLs.

Someone else may have a better suggestion for under hood wiring. I've never hooked up a light bar and I don't know very much about how the DRLs work with the high beams.
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Old 03-01-2021, 10:16 PM   #3
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Default Re: headlight/DRL wiring questions with adding aftermarket lights

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Originally Posted by Zeebins View Post
You might be able to use the high beam indicator bulb in the cluster as a 12v switch. It would be kind of a hassle to run a wire from under the dash to wherever your light bar is, but it would completely bypass the DRLs.

Someone else may have a better suggestion for under hood wiring. I've never hooked up a light bar and I don't know very much about how the DRLs work with the high beams.
That would probably work, I'd just have to find a pinout for the cluster, assuming its not a nightmare to pull the cluster on these anyway...
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Old 03-01-2021, 10:41 PM   #4
98_Gold_Uranus
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Default Re: headlight/DRL wiring questions with adding aftermarket lights

Or, you could disable the DRL function. Then the high beams will only be on when you turn them on, then you could simply wire the relay to one of the high beam bulbs to have it trigger it. I did exactly that on an old Corolla I use to have.

Unless your state requires the DRL, I'm pretty sure there are some that do? I disabled mine on my 98, pretty sure I just pulled the relay in the under hood fuse box labeled "DRL", but it's been a while so I don't recall exactly... Personal preference really, I don't care to have them on when the sun's out, I don't really see the point...


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Last edited by 98_Gold_Uranus; 03-01-2021 at 10:47 PM.
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Old 03-02-2021, 10:34 AM   #5
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Default Re: headlight/DRL wiring questions with adding aftermarket lights

You can't just pull the relay, it's a 5-pin and when the relay isn't on 87a powers one of the highbeam bulbs. You can pull it out, fold over pin 85 and put it back in however (or jump 30->87 with a 18awg wire).
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Old 03-02-2021, 05:11 PM   #6
98_Gold_Uranus
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Default Re: headlight/DRL wiring questions with adding aftermarket lights

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Originally Posted by fetchitfido View Post
You can't just pull the relay, it's a 5-pin and when the relay isn't on 87a powers one of the highbeam bulbs. You can pull it out, fold over pin 85 and put it back in however (or jump 30->87 with a 18awg wire).
Maybe that's what I did. It was a while back so I really do not remember... I followed a how-to here on the forum.

While we're on the subject, is there a way to trick the system (like the relay pin folding or jumper wire) into keeping the low beams on with the high beams? One that would also keep the fog lights on at the same time possibly?
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