Rewiring so fog lights come on with brights
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Rock Crawling
Joined: Dec 2006
Posts: 294
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Rewiring so fog lights come on with brights
I've updated the front bumper on my Disco to a Hard Labor Creek Fabrications winch bumper and installed a pair of Hella Driving lights.
Rather than having them come on with the dims, I'd like to have them come on with the brights as I only run them when out in the country or on trails.
Has anyone made this mod? Any tips or advice?
Rather than having them come on with the dims, I'd like to have them come on with the brights as I only run them when out in the country or on trails.
Has anyone made this mod? Any tips or advice?
Winching
Joined: Dec 2009
Posts: 685
Likes: 41
That would be your easiest bet since the relay is triggered through the body control module, however an easy / rough fix would just be to run an additional relay.
Signal wire would be from the high beam bulb wire, and output would be to fog lights. Wouldn't need a diode since even if they were on with low beams, they'd cut off through OE relay when going to high beams (and if high beams are off, your new circuit is always going to be open leaving original setup intact).
I had to do something similar to this when I did the 03-04 facelift headlights on my '99 - BCM turns off low beam output when you switch to highs due to the OE bulb on the 99s. With the independent high/lows on the new headlights I had to run the same relay setup as above to keep my low beams on when I switch to highs.
Signal wire would be from the high beam bulb wire, and output would be to fog lights. Wouldn't need a diode since even if they were on with low beams, they'd cut off through OE relay when going to high beams (and if high beams are off, your new circuit is always going to be open leaving original setup intact).
I had to do something similar to this when I did the 03-04 facelift headlights on my '99 - BCM turns off low beam output when you switch to highs due to the OE bulb on the 99s. With the independent high/lows on the new headlights I had to run the same relay setup as above to keep my low beams on when I switch to highs.
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Rock Crawling
Joined: Dec 2006
Posts: 294
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OK - So... What do I need to be able to reprogram the BCM?
A specific type of scanner?
A computer program and OBD2 Cable?
I don't want to have to go to the dealer to get this accomplished - $$$$$
A specific type of scanner?
A computer program and OBD2 Cable?
I don't want to have to go to the dealer to get this accomplished - $$$$$
Recovery Vehicle
Joined: Sep 2012
Posts: 1,169
Likes: 52
From: Tampa, FL
This page may help you wire in the lights to your brights using a standard relay. I'm not sure if your truck will have the stock aux light wiring, but I think it will. If so, it should simplify things quite a bit.
www.discovery2.co.uk Driving / Spot Lamps
www.discovery2.co.uk Driving / Spot Lamps
Recovery Vehicle
Joined: Jun 2012
Posts: 1,080
Likes: 57
From: Queens, NYC
I too recommend a BCM reprogram to accomplish this.
There was a made in China version that a lot of folks on here were raving about, if you search for the thread you'll find the vender, make/ model, etc.
There was a made in China version that a lot of folks on here were raving about, if you search for the thread you'll find the vender, make/ model, etc.
