How To Install Fog Lights Into A Fuse Box?

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When installing the fog lights to a fuse in the fuse box, the amperage must be considered and the proper circuit must be used. Fog lights would overload low amp circuits and blow a fuse. read on and find out how to install fog lights in a fuse box.

How to install fog lights in a fuse box

First of all, from a mechanic’s point of view it is not advisable or respectable to install a high amperage line in the cabin of a vehicle. All high amp lights, fans, etc. are activated under the hood with the use of a relay. The reason for this is that anything that draws a lot of amps tends to heat up the cable to some degree.

An insulation failure causing a short circuit will cause heat and sparks to melt the wire and an impending fire. Most breakers today are not designed for high amperage. Using a relay is much safer and very easy to install. The relay for the lights has four posts, and can be mounted anywhere under the hood. The main power for the lights comes from a larger 10mm wire that offers much less resistance than the normal 18 gauge wire found under the dash. There are two ways to install fog lights in a fuse box:

With a high beam switch

There is a 10mm wire that runs from the positive battery terminal to a terminal on the relay and a wire from the relay to the lights. This is the same as a light switch in the house, except it is turned on and off remotely. The other two posts on the relay are for switching power from a switch in the car, and the other post is simply ground.

The car switch draws hardly any power or amps and turns the relay on or off. It is possible to hook the fog lights to the main fuse and relay box under the hood, although the degree of difficulty is much higher. Locate the high beam relay for the headlights. Pull out the relay and check the power to the terminals with a voltmeter (the key should be off).

One terminal will have power all the time. This is the main one for the lights. Put the voltmeter on the ohm scale and remember which terminal was hot; do not touch this terminal while on ohms or the voltmeter fuse will blow. Check for ground. When you find a ground connection, remember which terminal it is on.

Check the continuity of the remaining terminals in the headlight connector. Once you find it, mark it or remember its location on the block, because that’s the wire the new lights will connect to. Remove the negative terminal of the battery. Remove the bolts that hold the fuse relay box to the bumper box. Cut or remove any device holding the harness to the fender so there is some slack available to turn the fuse holder upside down.

Turn the fuse holder upside down and remove the bottom part of the fuse holder. Be careful not to pull any pins out of the terminals as you search for the wire with continuity on the back of the terminal. Once found, check with the ohmmeter from top to bottom to make sure it’s the correct wire (you should know you’re looking for continuity).

Use a 10mm cable and clamp cable connector on the cable for the lights. Install the wire where it can be tied to the outlet harness and replace the lower fuse block cover. Replace the fuse block. Now the fog lights will turn on with the high beams.

Using a Separate Light Switch

You can also connect the fog lights to a separate switch in the cabin. Purchase a standard 4-pole fog light relay, a 30-amp in-line fuse, a remote switch that lights up to indicate when activated, 2 coils of wire, one 10-gauge and one 16-gauge, and a pack of assorted wire connectors. Mount the relay near the battery. Put the switch at the bottom of the dash or any convenient place.

Cut one length of 10-gauge wire to get from the positive battery terminal to the relay and two lengths of 16-gauge wire to get from the relay to the switch. Make a cut in another piece of 10-gauge wire to get to the fog lights. Put the 10-gauge piece going to battery positive and one of the 16-gauge wires going to the switch together into a yellow spade connector. Plug it into the battery + relay terminal.

You will need to cut a piece of 16 gauge wire to go from the ground on the relay to a ground on the chassis or battery negative. Attach a spade terminal to the wire and push it into the relay’s ground terminal. Attach the other end to a ground. Connect a spade terminal on the second wire to the switch and plug it into the SW terminal on the relay.

Attach the blue spade terminals to the ends of the 16-gauge wires to the switch and plug them into the back of the switch. Connect the 10-gauge wire from the relay to the positive wire from the fog lights with a yellow butt connector. Attach a yellow connector to the black wire (ground wire) from the fog lights, and then connect it to ground. Put a yellow circular wire connector on the last wire going to the battery and connect it to the positive battery post.

The lights can be safely turned on or off at any time. If the switch is an illuminated switch, some light up with the way it is already connected, and some need power for the light. If this is the case, then run a 16 gauge wire to the fuse box under the dash and connect it to any fuse that has power only when the key is on. Use a short piece of the switch to seal ground.

When installing the fog lights to a fuse in the fuse box, the amperage must be considered and the proper circuit must be used. Fog lights would overload low amp circuits and blow a fuse. read on and find out how to install fog lights in a fuse box.

How to install fog lights in a fuse box

First of all, from a mechanic’s point of view it is not advisable or respectable to install a high amperage line in the cabin of a vehicle. All high amp lights, fans, etc. are activated under the hood with the use of a relay. The reason for this is that anything that draws a lot of amps tends to heat up the cable to some degree.

An insulation failure causing a short circuit will cause heat and sparks to melt the wire and an impending fire. Most breakers today are not designed for high amperage. Using a relay is much safer and very easy to install. The relay for the lights has four posts, and can be mounted anywhere under the hood. The main power for the lights comes from a larger 10mm wire that offers much less resistance than the normal 18 gauge wire found under the dash. There are two ways to install fog lights in a fuse box:

With a high beam switch

There is a 10mm wire that runs from the positive battery terminal to a terminal on the relay and a wire from the relay to the lights. This is the same as a light switch in the house, except it is turned on and off remotely. The other two posts on the relay are for switching power from a switch in the car, and the other post is simply ground.

The car switch draws hardly any power or amps and turns the relay on or off. It is possible to hook the fog lights to the main fuse and relay box under the hood, although the degree of difficulty is much higher. Locate the high beam relay for the headlights. Pull out the relay and check the power to the terminals with a voltmeter (the key should be off).

One terminal will have power all the time. This is the main one for the lights. Put the voltmeter on the ohm scale and remember which terminal was hot; do not touch this terminal while on ohms or the voltmeter fuse will blow. Check for ground. When you find a ground connection, remember which terminal it is on.

Check the continuity of the remaining terminals in the headlight connector. Once you find it, mark it or remember its location on the block, because that’s the wire the new lights will connect to. Remove the negative terminal of the battery. Remove the bolts that hold the fuse relay box to the bumper box. Cut or remove any device holding the harness to the fender so there is some slack available to turn the fuse holder upside down.

Turn the fuse holder upside down and remove the bottom part of the fuse holder. Be careful not to pull any pins out of the terminals as you search for the wire with continuity on the back of the terminal. Once found, check with the ohmmeter from top to bottom to make sure it’s the correct wire (you should know you’re looking for continuity).

Use a 10mm cable and clamp cable connector on the cable for the lights. Install the wire where it can be tied to the outlet harness and replace the lower fuse block cover. Replace the fuse block. Now the fog lights will turn on with the high beams.

Using a Separate Light Switch

You can also connect the fog lights to a separate switch in the cabin. Purchase a standard 4-pole fog light relay, a 30-amp in-line fuse, a remote switch that lights up to indicate when activated, 2 coils of wire, one 10-gauge and one 16-gauge, and a pack of assorted wire connectors. Mount the relay near the battery. Put the switch at the bottom of the dash or any convenient place.

Cut one length of 10-gauge wire to get from the positive battery terminal to the relay and two lengths of 16-gauge wire to get from the relay to the switch. Make a cut in another piece of 10-gauge wire to get to the fog lights. Put the 10-gauge piece going to battery positive and one of the 16-gauge wires going to the switch together into a yellow spade connector. Plug it into the battery + relay terminal.

You will need to cut a piece of 16 gauge wire to go from the ground on the relay to a ground on the chassis or battery negative. Attach a spade terminal to the wire and push it into the relay’s ground terminal. Attach the other end to a ground. Connect a spade terminal on the second wire to the switch and plug it into the SW terminal on the relay.

Attach the blue spade terminals to the ends of the 16-gauge wires to the switch and plug them into the back of the switch. Connect the 10-gauge wire from the relay to the positive wire from the fog lights with a yellow butt connector. Attach a yellow connector to the black wire (ground wire) from the fog lights, and then connect it to ground. Put a yellow circular wire connector on the last wire going to the battery and connect it to the positive battery post.

The lights can be safely turned on or off at any time. If the switch is an illuminated switch, some light up with the way it is already connected, and some need power for the light. If this is the case, then run a 16 gauge wire to the fuse box under the dash and connect it to any fuse that has power only when the key is on. Use a short piece of the switch to seal ground.

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