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Old 08-16-2005, 08:34 PM   #1
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How to install to headlight switch

How do you install an accessory to the headlight switch so you when you turn on the headlights and/or parking lights, it goes on. I ask this for the gauges I just got, I only want them on when the lights are on. Thanks.

-Ryan


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Old 08-16-2005, 09:54 PM   #2
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In my 82 Bonneville, I rigged the CB radio to go on only when the lights are on. I did this by using the light that illuminates the ashtray as the power. The CB goes on only if the parking/headlights are lit.


---Randy
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Old 08-16-2005, 10:01 PM   #3
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Nice Randy, anything less riged? I take it for the light switch that the top row of wires in negative and the bottom is positive or soemthing like that? Just need to know what wire to splice.

-Ryan
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Old 08-16-2005, 10:28 PM   #4
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I'm not sure on the Focus wire colors. The 82 Bonneville is totally different...I figured that red would be the power and black would be the ground..wrong. Yellow was power and the ground wasn't black...


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Old 08-16-2005, 11:05 PM   #5
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There are like 12 wires.

-Ryan
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Old 08-17-2005, 05:41 PM   #6
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parking lights on a focus are positive triggered: orange with a yellow stripe behind the light switch (or GEM module). the safest way to do this is to use a SPDT 12v bosch style relay. Here's the pin number and association:

pin 85: connect to ground
pin 86: connect to orange w/ yellow
pin 87: connect to fused source of 12v+
pin 87a: nothing.
pin 30: connect to device you are going to turn on


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Old 08-17-2005, 08:30 PM   #7
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just to add a few more things...

as for what i wrote above, some [understood] things that i should make clear anyway...

pin 30 should be connected to the positive terminal of the device you are going to turn on. however, the negative terminal of that device will still need to be grounded.

if you want to have a separate switch, such as to turn this device off even if the parking lights are on, you would wire a on/off switch in series with pin 85. therefore, in order for the relay to energize, the parking lights would need to be on, and the switch also be 'on'.

hope that answers any future questions too.

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Old 08-17-2005, 11:05 PM   #8
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That does help actually. Alright so I have 3 lights that are going to have to be wired in and I decided that I want them on when the parking lights are on but without the on/off switch. So question is, do I wire all of the lights onto that one wire then and the grounds to the chassis?

-Ryan
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Old 08-17-2005, 11:38 PM   #9
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gotta watch out for which relay you choose. Some of the bosch style relays are designed to work with 30A of current passing through the contacts in the 'normally-open' mode (which is what you're doing), and some are designed to work with 20A of current. What wattage are these light bulbs? To calculate the current of each light bulb, divide the wattage by 12 [volts]. So, if each bulb was a 100w bulb, each bulb needs to have 8.3 amperes flowing to it. so if you have three 100w bulbs, then you'd need a 25amp circuit (as well as a relay that can handle 30A)

Honestly, to deliver 25 amperes of current, I suggest running pin 87 on the relay directly to the positive terminal of the battery. It'll be the best place to get the needed current. Make sure you use a fuse inline with that (between the positive battery terminal and pin 87) with an appropriate fuse.

yes, you would connect all three positive terminals of the lights and connect them to pin 30. then, ground the three negative terminals to the chassis.

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Old 08-18-2005, 04:11 AM   #10
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remove the lower panel under the steering column, I believe the wire is Orange/black for headlight power switch.

I can verify this tomorrow if you want.
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