Hi there -- First time post. I have a 2002 Disco that came with stock fog lights that worked prior to removal. I built my front bumper and installed aftermarket round yellow LED fog lights. I tested each with a battery, and the work great. To wire them, I cut the wiring off the stock fog lights and soldered them to the aftermarket lights--and plugged them into the stock harness. For the life of me, I can't get them to work.

I checked all the fuses, pressed every single button on the dash and they don't work. What could the problem be? Do you think it's because I LEDs?

Separately, I'd like to utilize some of the non-working dummy switches on the dash to energize other accessories. Can someone point me in the right direction on how to do this?

--Cheers, Chris

 

Have you checked for voltage, at lights,, when foglight switch is activated? They only work while dims are activated, also.

 

Hi Chris, welcome! As The Deputy mentioned, make sure your low beams are on and then check. I too have installed LED's and they work fine so I doubt that's the problem. If memory serves I had an issue where a black wire was positive, not ground, so my polarity was reversed which an incandescent bulb doesn't care about but an LED certainly does, so check to make sure your polarity is correct while you are in there with a multimeter.

As to your second question you best bet is to find cruise control switches (I know there are others) but the important part is that they are latching switches. That is to say when you push them in they stay physically pushed in. Then wire those up to relays to power your installed secondary electrics. Alternately, as I have done, you can install carling switches in to a frame which replaces either the coin or ash tray. I think you can buy the frame aftermarket or you can 3d print one off if that's available to you (search discovery 2 carling switch on Thingiverse).

 

Hi Gents:

Thanks for all the help! I didn't realize LEDs care about polarity. I bet that's the problem, and I'll have a look today.

Thanks too about the cruise control switch button. I think that's just the ticket.

--Chris

 

Are you me? I just went through the same confusion last night while replacing the LR fogs with LED pods. Started over this morning and found that I needed to wire red to black and black to brown and the new lights are working great!

 

Hi Gecko:

Haha! That's exactly what I figured out thanks to this group.

--Thanks, Chris