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Old 01-21-2003, 03:02 PM   #1
wingtipz
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Default Someone confirm/deny method for switching driving lights/high beams on at same time

A while ago in the thread below there was discussion on what it takes to make the PIAA 80's or Hella 500's driving lights come on with the high beam.

http://forums.nasioc.com/forums/show...hreadid=296784

Obviously you need to do the foglight mod for the circuit to work with the high beams, but there are still questions as to how exactly the relays need to be set up in order for the driving lights to come on when the high beams are switched on.

Can anybody clear this up?

Thanks.
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Old 01-21-2003, 04:30 PM   #2
amelnikov
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Basically what I did is tap the wire into the parking lights wire. This way as long as the parking lights are on, the driving lights are on and are not dependent on high or low beams. There is a nice "how-to" at scoobymods.com.

Alex...
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Old 01-21-2003, 06:27 PM   #3
wingtipz
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But that's not what I want to happen. I want the driving lights to be on when the high beams are on and turn off when the high beams are dimmed. Also this should only happen when the stock fog switch is on. The fog mod so that they switch can be on no matter what the headlights are doing is no problem, wiring all this to happen with the high beams is the question.

Gabe.
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Old 01-21-2003, 11:05 PM   #4
GLwagon
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It can be designed & built, but under the factory wiring the option the only "easy" way is to swap the hi & low beam wires...
I'm just not sure what to do with the high beam indicator on with the lows...

I'll have to look at the schematics & get back to you...
how good are you with wiring?
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Old 01-22-2003, 12:54 AM   #5
tdxflex
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piece of cake. all the wiring happens at the front of the car too near the battery for convenience

use the relay that comes with your lights and follow the wiring below. Mount the relay near the battery behind the headlight, all of the wires you need are at the headlight and the battery terminals.

Just for reference, here's color codes for the wires you'll be tapping into at the headlight harness:
red - switched ground for high beams
yellow/something else - switched ground for low beams
blue/red - power when ignition on and headlights on

so when the high beams are on, the red wire goes from 12V to 0V, that's what you want to use for your control.

85-blue/red wire (headlight power)
86-red wire (switched ground for high beam, goes to 0V when high beams are engaged, otherwise 12V)
30-battery with fuse
87-driving lights
place a diode in parallel between the 85 and 86, cathode end on the 85 so current can only flow from 85 -> 86, and no current the other way around

the 30 and 87 terminals connect when there is current flow between the 85 and 86. There is only current flow when you have a difference in potential (one terminal at 12V, the other at 0V). So even though both the 85 and 86 terminals are at 12V, there is no difference in potential so there is no current flow so the lights don't turn on. when the high beams are turned on, 86 goes to 0V, current flows from 85 to 86, 30 and 87 are connected and the lights turn on. when the high beams are turned off, 86 goes back to 12V. Just in case there was a current spike, the diode supresses it to keep everything under control.
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Old 01-22-2003, 11:24 AM   #6
Alan
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Quote:
Originally posted by wingtipz
But that's not what I want to happen. I want the driving lights to be on when the high beams are on and turn off when the high beams are dimmed. Also this should only happen when the stock fog switch is on. The fog mod so that they switch can be on no matter what the headlights are doing is no problem, wiring all this to happen with the high beams is the question.

Gabe.
Basically that's what I've done. I've got HID lights replacing the 9007 units, and Hella 500's using the stock wiring and a fog light mod. Adding a diode from the headlight high beam wire to the fog light switch makes the Hella 500's act as high beams.
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Old 01-22-2003, 11:41 AM   #7
Jack
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Daytime running lights makes things a bit difficult, but any car can be made to do what you want. This is one of the first things I do with any new car....make all the lights come on when the hi beams are activated.

Since DRL's are on all the time, (hi beams at reduced power), use 2 relays. One activated by the high beams and the 2nd activated by the side marker lights. Now take power from the battery through a fuse and through the switched terminals of both relays in series and end up at the fog lights. I use a 2 switch relay so when the high beams and side markers are on (real high beam, not DRL on) then along with the high, the low and fogs all come on.

jack
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Old 01-24-2003, 03:04 AM   #8
SR-71WRX
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Anyone know how much the wire harness would cost if you got it from a company like PIAA? That way you could just wire it totally seperate and you could use much higher wattage bulbs... there has to be a part # and I know it's possible to order.
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Old 01-24-2003, 04:19 AM   #9
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Quote:
Originally posted by SR-71WRX
Anyone know how much the wire harness would cost if you got it from a company like PIAA? That way you could just wire it totally seperate and you could use much higher wattage bulbs... there has to be a part # and I know it's possible to order.
All you need is a relay that can support the current needed for whatever watt bulb you are using. The ones that come with most aux light kits are only rated fro 15amps. If you want to use a really bright bulb, just buy a 30amp bosch relay or something similar - $1.99 from partsexpress.com. the control for the relay (85 and 86 terminals) probably never pull close to 1 amp so you don't need to worry about current drain there. all you need to worry about is the correct gauge wire needed for the current from the battery to the 30 terminal going to the lights at the 87 terminal. just use some 14gauge wire to be on the safe side and you'll have no problems.
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Old 01-24-2003, 11:58 AM   #10
Alan
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You also need some better 9007 bulb sockets. The OEM ones on the 2002-2003 car will often melt if you use 80/100 watt bulbs. Luckily there are better ones for around $5 or so, but the design of the 9007 bulb is somewhat limiting due to the small contact pins.
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Old 01-24-2003, 12:38 PM   #11
Flesher
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I had the same question. Initially I hooked my lights up to the high beam switched ground, but the problem was that it was also grounded when the lights were off. With some investigation, I discovered that the low beam ground is positive when the high-beams are on and grounded when the low beams are on or the lights or off. Thus, in order to have your driving lights operate with the high beams connect the relay like:
30 - Battery +
87 - to lamps
85 - ground
86 - to switch
yellow/red wire on headlights also to switch.

I have my driving lights hooked up this way and they appear to work great. The switch will only turn the lights on when the high-beams are also on.

Nathan
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