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Can someone tell me what wire is the ground wire in the optronics MH-500D fog lights

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SOURCE: Wiring front fog lights to a 2002 freelander ES.

Do not fit these lights yourself,you must take the vehicle to the dealer to have it done .Firstly as vehicle wasnt factory fitted you need the original homoglonation certificate from the manufacturer for the model with the foglights fitted,then you need a installation project drawn up by certifide auto engineer with the relevent technical qualifications (i have them) then they can only be fitted by a garage with an added value tax certificate,then vehicle must be presented to the local vehicle inspection depot to be mechanically inspected all over weither its due or not,the relevant paperwork plus the fee presented ,then a new vehicle registratrion document issued showing the changes.Failure to to this will cause the vehicle to fail its inspection when next presented as paperwork isnt correct ,the lights are ilrevelent as to weither they work or not,but if fitted from new they must work.Also if stopped by the guardis civil and paperwork checked,and they notice then you risk having the vehice impounded their and then on the spot ,big fine and the cost of the removal truck.

Posted on Mar 15, 2009


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Have a dirt bike with headlight. Three wires for hi/lo, how do I put two fog lights in place of that head light without too much wiring work. I don't need hi/lo option

one wire will for high beam
one wire will be for low beam
the last wire will be ground wire
as fog light have only one beam you can use the low beam wire and parallel wire it to the fog lights
that way you have the head lights still and the fog lights as accessories correctly wired according to regulations
how to do it simply-- find the low beam power wire ( light switch on low beam and power at the light bulb check ed with a multi meter set on volts
solder , piggy back, or double plug in a connection into that wire and run one wire to the left fog light and one to the right fog light connect each fog light to an individual ground wire and connect those wires back to the ground wire for the main lights
Now having done that simple addition to the lighting system another problem has come up
The wiring will now be too light to carry fog light current and or the light switch will burn out
To over come this problem, the circuit needs a relay
fit a relay on the bike and now run the low beam wire to a terminal of the relay
run the other terminal wire to ground
this enables the relay to operate when the low beam is switched on but at this will not switch on the lights yet
now you have to run a heavy gauge wire (fused at the battery) to one of the power terminals of the relay and from the other power terminal to the connection for the fog and low beam lights
Now it all works switch on the high beam and no for lights
change to low beam and the fog lights come on as well
All nice and legal
Of course if you don't care about being legal just buy a 30 amp toggle switch and run a fused wire directly to the switch from the battery to the lights and then to ground from the lights
You will know that the generator / alternator for the bike will not be able to run the fog lights with or without the main lights so what will you have achieved

Feb 28, 2016 | Cars & Trucks

1 Answer

Headlights won't come on together on 2002 dodge caravan. Change the CCM & ECM no change, any other suggestions? Thank you


When a vehicle experiences problems with the headlamp system, verify the condition of the battery connections, fuses, charging system, headlamp bulbs, wire connectors, relay, high beam switch, dimmer switch, and headlamp switch. Refer to the appropriate wiring information.
Each vehicle is equipped with various lamp assemblies. A good ground is necessary for proper lighting operation. Grounding is provided by the lamp socket when it comes in contact with the metal body, or through a separate ground wire.
When changing lamp bulbs check the socket for corrosion. If corrosion is present, clean it with a wire brush.
When it is necessary to remove components to service another, it should not be necessary to apply excessive force or bend a component to remove it. Before damaging a trim component, verify hidden fasteners or captured edges are not holding the component in place. Don't replace parts unless you test an your sure that is the problem. Check the basic's first ! Then find a wiring diagram an see what all is involved , connectors , grounds , power an do a voltage drop test on the circuit to find the problem !An a scan tool would come in handy as well ,to do bi-directional tests !


The configuration of the headlamp system of headlamps, park lamps and fog lamps is determined by the BCM. The BCM -body control module determines the lighting configuration as a result of the inputs from the ignition switch, headlamp switch and multi-function switch. A PCI bus-serial data communication network is transmitted from the BCM to the FCM to enable the necessary drivers to set the illumination configuration. Four wires are connected between the headlamp switch and the BCM. The first wire contains information regarding the position of the headlamp switch (Off, Automatic Headlamps, Automatic Headlamp switch fog, Park with Fog, Head, or Head with Fog Lamps). The second wire contains information regarding the position of the dimmer switch (Dome Lamp, Daytime Brightness, Dimming Level or Off). The third wire is a dedicated signal return (ground) wire. The fourth wire provides power to the front fog lamp indicator. You should take this to someone who knows what's up rather then just replacing parts !

Jan 30, 2015 | Dodge Cars & Trucks

2 Answers

No headlights or fog lights

I suspect it is the headlight switch

Mar 18, 2014 | 2004 Pontiac Grand Am

1 Answer

I have Nissan TIIDA latio 2007 e-4wd. I installed fog lights with pre wired availability. Now tell me how i connect the switch for fog lights

Run a ground wire from the lights to a good ground on the frame. I usually look for an available wire connection near the battery, sometimes the factory will have extra wires going from the battery not hooked to anything. Other wise, check at the alternator, a wire may be exposed there. Make sure there is a fuse in your new wiring, and run that wire to the switch for the new lights, and then from the switch run a wire to the lights.

Dec 01, 2013 | Nissan Cars & Trucks

1 Answer

2004 tundra fog lights do not turn on.

Try to wire them straight to 12v to rule out anything with the lights themselves. You've tested with a meter to the leads at the light with them switched on?

Mar 15, 2012 | 2004 Toyota Tundra SR5

1 Answer

Y reg(1982) austin mini 998cc, when the heater is switched on the fog light switch lights up but heater fan does not start, fog light doesnt work either, have tried changing the switch but no difference,...

Chances are that not all grounding wires are earthed. You may have a floating ground that is feeding back through the lights. Try grounding the heater directly to start your diagnosis.

Dec 13, 2009 | 2000 Mini Cooper

2 Answers

Turn singles work in the back but not in the front or hazard lights and the fog lights dont come on fuse is good and flasher is good

the haz switch may be at fault which is the only common link in the turn signals and hazard, but if the fogs dont work you may have a common earth lead running the front lights so trace that and clean, as fogs are not attached to the turn signals if the earth is not the fault trace fault on each as separate problem, fogs should be only working when your drinving lights are switched on

Dec 05, 2009 | 1998 Pontiac Firebird

1 Answer

Fog lights not working

the red is the power and the black is the ground.measure the resistance from the black wire to the car body,it should be a short or very low resistance.the red wires go to the fog light switch and the fusebox.if you ground the fog lights one at a time,they should come on.

May 26, 2009 | 1989 Jeep Cherokee

1 Answer

Right Side taillight and front fog light not working

If you have a test light, connect direct to wire feeding tail light and a body ground to see if there is power. If there is, take probe and touch ground wire of bulb. If you test light comes on, you have lsot ground. If this has helped, please post as helpful. For faster help, please go live chat

Jan 14, 2009 | 2005 Chevrolet Aveo

1 Answer

1996 jeep cherokee sport. I am trying to install a fog light kit. one switch, 2 fog lights. Need color wiring diagram or how to instructions. kit directions are terrible

If it's a lighted switch, you should have 3 terminal connections on it. One for the "ignition on" wire (from your fuse box). One going to the fog lights to turn them on when you flip the switch and one ground for the switch light to work. If your switch doesn't light, you should only have 2 terminal connections (no ground).

Find an "ignition on" plug on your fuse panel. It is only hot when you turn your ignition to the on position (not crank position). With your keys out, it should not have any power to it. Hook your "hot" wire from fuse panel to switch, take your keys out of the ignition first to be safe. Now hook the other wire from the switch to the "hot" on your fog lights. You will have to find a pass through rubber grommet on your firewall to go through. Use a clothes hanger to help fish it through. Now ground your fog lights to a grounding screw somewhere in the engine bay. There should be a few you can use, possibly one of the bolts that hold the front shroud on. Make sure it's a metal surface and use sandpaper to scrape off paint to get a metal to metal contact. Cover area with petrolium jelly to ward off rust. If your switch is lighted, hook to ground wire on fuse panel. Test with ignition on. If it doesn't come on, check your grounds again.

Sep 21, 2008 | 1993 Jeep Cherokee Country

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