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Aiming Fog Lights

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wedgewa
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Aiming Fog Lights

Postby wedgewa » 03 Sep 2009 04:49

My 1980 still has its original 30th Anniversary Edition Bosch fog lights on the front. They were among the many parts removed for a serious repaint (pics in my photo album).

Now that the car is again whole and the lamps are lighting, is there a particular method of aiming the fog lights? Or is it just pointing them generally toward the bumpers of oncoming traffic? I've never seen any specific info.

jclay (RIP 2018)
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Postby jclay (RIP 2018) » 04 Sep 2009 01:35

I have not seen any specs on aiming the front fog lights. I use my garage door with the normal beams on. Fog lights give a wide flat beam of light as compared to driving lights. You want the lights beams to be parallel to the ground and lower than the normal beams.

Also, remember that in many states, it is illegal to have the fog lights operational while the high beams are on. If that is the case, use two relays to power your fog lights. Wire the first relay so the power going to the lights are on the normally closed position and the activation circuit is wired to the high beam circuit. You then take the power wire from the 1st relay and connect it to the power in on the second relay and the wires to the lights to the normally open side. Connect the activation circuit to you fog light switch.

That way the first relay is invisible in the circuit when the normal beams are on or the head lights are off. It will cut power to the fog lights when the high beams are switched on.

jclay

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wedgewa
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Postby wedgewa » 04 Sep 2009 03:24

Hey thanks, that's good advice and makes complete sense.

The fog switching in this car is "interesting" - and being the original owner, I know the wiring is as-delivered including the original switch. The fog switch has 3 positions. Up is off while center and down both turn on the fog lights regardless of what other lights are turned on. However, the amber dash indicator in the fog switch does not light unless the master lighting switch is on - either parking or headlights. Selecting high beams turns off the amber fog switch dash lamp but has no effect on the actual fog lamps.
This is an original 1980 California car. The wiring came in handy many years ago when I stopped at the top of a 2-lane mountain pass between Idaho and Jackson, Wyoming at 1 in the morning to show my then 7-year old son the stars. The stars were great but when it was time to leave, the master light switch physically broke in the center parking light position and I had no headlights to descend the twisty pass. But I did have the parking lights and the fog lights to get down to the hotel. And then drive on to Denver only in daylight!

I previously and briefly (in 1980) owned a 1980 Federal 30th Anniversary Edition with the same lights. (That car was short-lived...rear ended and totaled by a drunk in a much larger truck). But on that car, the fog lights would not operate without the headlights on. Glad I didn't have that one up on that pass!

Odd
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Postby Odd » 04 Sep 2009 13:50

wedgewa - Remember you're in America...
The fog circuit is designed to operate the rear fogs as well - and you probably don't have those on your car...
That's the third position on the switch. And it's designed NOT to allow rear fog lights in connection with high beam on the front lights.
For obvious reasons...

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saabfast
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Postby saabfast » 04 Sep 2009 19:55

Not sure what they fitted to US cars but in the UK in those days it was common to fit a fog light (wide flat beam) to the nearside and a spot light (pencil beam) to the off side but angled to pick up the kerb about 30' ahead. This was for use in fog, as opposed to the 'driving lights' fitted now which can be used anytime other than in fog (when they reflect back).

Alan
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wedgewa
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Postby wedgewa » 06 Sep 2009 02:02

This is great. I've had this car for nearly 30 years and this is the first really good fog light info.

The lights of the "30th Anniversary Edition" were a matched pair of Bosch fog lamps. Wide flat beams using an H3 bulb.

The comments about US vs Europe got me Googling. I've never seen factory rear fog lamps on a US car (though some of the US parts dealers had them available in the past). I did know that at one time there were seperate front and rear fog switches on the dash and they were later combined into a single switch. I looked around the back of my car when I replaced the trunk lining. Didn't see any unused wires that could power rear fogs but they must be back there somewhere.

I found that California has extensive detailed regs for both front and rear fog lamps (including some aiming rules) while Washington State only has semi-specifics for front fogs. No WA regs for rears except a mention that they can exist subject to an SAE guideline.

The rules I found seem to indicate that any combination of 4 forward lights can be on. And that fog lamps should not cause the number 4 to be exceeded. And they cannot be used alone instead of headlights. Also the amber dash indicator lamp is required to show when rear fog lamps are on.

I didn't find anything saying the rears have to go out when the front high beams come on. Although my TR7 doesn't have rears, that does seem to be the way it's wired from the operation of the amber dash light. It doesn't seem logical to me that would be required.

On my Jaguar with factory front and rear fog lamps, the front fogs go out when the high beams come on. The rear fogs stay on unless manually switched off. That makes more sense to me and relates well to the regs I looked up.

According to the state regs I read, the TR7 factory front fog light mounts are a bit too low to the ground (by about 1.5 inches) to be legal. But they're close...

I appreciate all the info responses. Even after all these years, there are still new things to learn. And the more I know about my car the happier I am!

Complements to all. Some of the forums I visited for other car makes seem to argue more than inform. But not here thankfully!

jclay (RIP 2018)
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Postby jclay (RIP 2018) » 06 Sep 2009 21:40

The front fog lights run off a red/yellow wire from the switch while the rear fog lights run off a red/blue wire from the switch. Check the ribbon loom in the trunk, right side under the rubber cover.

The wires also run in the wiring harness on the right inside corner of the engine compartment next to the radiator.

jclay

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