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Old 12-07-2012, 01:03 AM   #1
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Need help figuring out how to wire auxilary light

I made a bracket to mount behind my taillights for an auxilary light. I plan on using a cheap fog light so I can see when loading up the boat or a deer. I want to be able to turn it on with a simple toggle switch but don't want to wire it to come on with reverse lights. I know I need a relay but have no idea how to wire it in or the best location for it. Should I put the relay closer to the light or under the hood?
Also what gauge wire should I use? I have looked at a ton of wiring diagrams and am just as confused now as when I started. I don't want anything complicated but just some thing that is safe and won't short out! Any help is appreciated.

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Old 12-07-2012, 06:13 AM   #2
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Put Relay closer to Power source (Likely Under Hood) Google Bosch Relay Wiring Diagrams for wiring info.

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Old 12-07-2012, 06:33 AM   #3
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If you are running your own wire for this, I don't really see any need for a relay, assuming that you are running a single fog light. Just get a decent toggle switch, some 14 gauge wire and an in-line fuse/fuse holder from the auto parts store.

Assuming your light mount is a metal mount and mounts to a part of the Jeep that is already electrically grounded, you only need one wire from the fuse box or battery that is +12V (positive terminal of battery) that runs from the power source, through the fuse, through the switch and on to the light.

The application is a simple light that you are going to run periodically for short periods of time, no need to make this more complex than it needs to be.
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Old 12-07-2012, 08:14 AM   #4
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Originally Posted by giles45shop View Post
If you are running your own wire for this, I don't really see any need for a relay, assuming that you are running a single fog light. Just get a decent toggle switch, some 14 gauge wire and an in-line fuse/fuse holder from the auto parts store.

Assuming your light mount is a metal mount and mounts to a part of the Jeep that is already electrically grounded, you only need one wire from the fuse box or battery that is +12V (positive terminal of battery) that runs from the power source, through the fuse, through the switch and on to the light.

The application is a simple light that you are going to run periodically for short periods of time, no need to make this more complex than it needs to be.
x2
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Old 12-07-2012, 08:26 AM   #5
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Old 12-07-2012, 08:45 AM   #6
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For something that simple I would not use a relay. The purpose of a relay is to take the big load off your switch. If you use a relay the switch then simply triggers the relay on, and then the power to the accesory is from the relays contacts...not the switch. But in the case of one light a simple toggle switch would be fine. Remember you need a power and ground at the light. Most problems occur with a poor ground connection. So make sure it has a perfect ground or you will get a dim light or one that flickers, etc. Good luck
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Old 12-08-2012, 12:55 AM   #7
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Used this for my reverse lights. Got to admit it is nice to have the on-off-on function. Hope this helps.

How-to: Wire Backup Lights to a 3-Way Switch - Second Generation Nissan Xterra Forums (2005+)
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Old 12-08-2012, 03:55 PM   #8
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Thanks for all the replies. I found an led light instead so I won't use the relay due to the low amp draw. Here's a link to the light...
AGT LED Off Road Light 4X4 Work Light Waterproof 27W 12V 6000K (60 Deg Flood):Amazon:Home Improvement

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