Question about 2003 Isuzu Rodeo

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Hi, i found a fog light in my shed, i want use it on my car for a reverce light..do i need to wire a relay??....& if so why?? thanks joe.

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More than likely you will need to use a relay. Your reverse lights are rated for a particular amperage. The wiring, fuse and components are engineered for the amp draw. Adding an extra load like a high wattage fog lamp can cause the fuse to blow or damage the components/wiring to the reverse lights.

Relays work great for this type of application. They use a small amount of current to control a large amount of current. So adding a relay into the reverse light circuit will minimize the load draw on the circuit. It will then control either a fused power or ground (i prefer to wire them as ground side control so they aren't talking the brunt of the load which will make them last longer) that you run directly from the battery.

Posted on Oct 14, 2010

Testimonial: "thank you guru for your help...thats handy to know about the relay. thank you for your time & quick response. joe.... from down under in melbourne"

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1 Answer

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

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1 Answer

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Yes you can, if by fog lights you mean after market ones., Just takes a switch, wire, 40 amp fuse and 5 pin relay, soldering iron, wiring conduit, sharp edge to bare wire, wiring diagram and some insulation tape.

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it can be a load shedding ,in many cases is the earth wire fault ,if ok check the relay return wire/earth

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I have a 99 chevy silverardo and i hunt i was wanting to know if there was anyway of killing the headlights so when i get there i can drive by my fog lights only way iv found out is depress the e-brake but...


Hi trav..... Call a local autoelectric repair shop. they are listed in the phone book. They will have the wiring diagram for your truck and they will be able to put in a special switch that will allow you to use the fog lights only without the bell!

Joe

Thanks for choosing Fixya!

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Wiring for Bosch Hologen Fog Lights? Wiring harness has 5 wires from relay, Red to battery, 2 Black - 1 to each light?, 1 Yellow to?, 1 Blue to?, & where do the xtra Black and Green wires go to? These...


Look on the relay for the terminal numbers.
Terminal 30 goes to the battery positive.Red Wire
The two terminal 87 go to the fog lights.Black Wires
Match the color wire with what you have on the relay connection for the rest of the wires.
Terminal 86 should connect to your low beam headlight.
Terminal 85 should go to the fog light switch.
The fog light switch should connect to the terminal 85 and the other terminal on the switch will connect to ground.

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Sounds good to me except, the switch light shout be on the relay primary circiut and light off until you turn it on. When you turn the switch on, it lights up and energizes the relay, the relay closes and completes the secondary circiut for ythe fog lights. VIOLA' I have a silverado. done deal thanks

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The 15 amp FOG fuse is in the fuse box in the engine compartment, at the bottom, right between the fog light relay and the fan #1 relay. The fuse is by itself, there are no other fuses next to it. Hope this helps, and thanks for choosing FixYa.

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I just saw fog lights on e-bay for about $125 - $130 + shipping.
So the relays are there? I have not checked not car yet. I was told fogs need a "J relay" and a "white relay with green feet" under the driver's side knee bolster, and a "gray relay" at the fuses. Please let me know if you have part numbers in case I need to order them. (Maybe I will try a donor car from a salvage yard). Good luck.

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