fog lamp relay wiring

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fm915dj

Member - Posts: 8

Joined: December 05, 2006

Location: United States

Posted: November 14, 2010 at 1:38 PM / IP Logged

Thanks to all for the input! Here's what I've come up with: Two Relays. First as follows: 85 to ground, 86 to low beams positive lead, 30 to fused constant +12VDC 10A, 87 to 30 on second relay, 87a not used. Second relay as follows: 85 to ground, 86 to high beams positive lead, 30 to 87 on first relay, 87a to fog lamps positive lead, 87 not used. Lets try that on for size, any thoughts?

howie ll

Pot Metal - Posts: 16,466

Joined: January 09, 2007

Location: United Kingdom

Posted: November 14, 2010 at 2:21 PM / IP Logged

Spot on, sorry for the confusion, as Mr. I pointed out I didn't read the first post PROPERLY.

The bit that got me was the low beams staying on when you activate the high beams, a million years ago I had a Ford Capri , the factory lamps had either H1 or H2 bulbs.

I changed all 4 to Cibies with H4s on the outers and had to relay them to run that way, i.e. like yours it has kind of stuck in my mind ever since then (1978) that ALL cars dumped the low beams when the high beams came on, stupid of me so sorry.

Incidentally in Europe, we MUST also be equipped with (slightly towards the orange) rear fog lights. Usage rules are quite strict. Basicly fog, very heavy rain or falling snow.

In the front, i.e. normal fog lights, must be a matching pair, again restricted use but the law turns a blind eye on fronts being used for "hedge and roadside obstacle" illumination.

fm915dj

Member - Posts: 8

Joined: December 05, 2006

Location: United States

Posted: November 14, 2010 at 3:42 PM / IP Logged

Howie, no apologies necessary. I'm not exactly sure as to the thinking behind General Motors' engineering of the lows and highs being on at the same time. All of my current vehicles made by GM are this way. I probably should integrate a switch for the fogs but I usually leave them always on in my other car so I figured I'd do the same in this car. I haven't had any issues yet as far as legality. Also, in the interest of asthetics (and laziness), I don't want to add an aftermarket switch in the cabin which will look out of place. I'd add an OEM switch but it just sends a signal to the BCM to activate the fogs. Too complex (and expensive for reprogramming) for my blood. Thanks again to all and take care.

oldspark

Gold - Posts: 4,913

Joined: November 03, 2008

Location: Australia

Posted: November 14, 2010 at 7:00 PM / IP Logged

I see the sense for hi with low.

My 1965 vehicle has it, albeit currently using H4 outers but on full-time low beam.

I decided to keep that feature after replacing my BMW inserts which were dedicated H1 lows (as on their 3 Series (323?)). It was the traditional 4-headlight with outer hi/low.

It was also something I had on my rally car. It caused huge argument amounst rally regulators and authorities.

Guess who won that argument too? (Too many idiots in the wrong places. FIGJAM again!)

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fog lamp relay wiring

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