Aux Reverse Lights question -
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post #1 of 3 Old 06-18-2011, 09:19 PM Thread Starter
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2004 WJ 
Join Date: Oct 2007
Location: Spokane
Posts: 128
Aux Reverse Lights question

Ok so I have a 4 pin relay and an on-off-on switch and two aux lights. I would like to wire it up so at one ON position the lights come on with the reverse lights and the other ON with the switch. I have an idea but I wanted to check with others. This is what I'm thinking
85- reverse lights
Then I'm confused, for the positive pin on the relay would I use an ON wire from the switch or just a normal power wire?

Then for the switch ON I'm also confused. I had this figured out but it escaped me. Any ideas?

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post #2 of 3 Old 06-19-2011, 02:46 PM
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2005 KJ Liberty 
Join Date: May 2009
Location: Clayton, NC
Posts: 99
Use a five pin relay. Run the light to the "30" post. The reverse wire feed goes to "87A" and the power input for the lights to be used whenever goes to "87". Run your off and on switch to the "85" side and ground the "86".

Sound confusing I know. However this will allow the relay to ALWAYS have power going to the lights to allow them to cut on when in reverse then when the switch is active it switches the lights to a steady on. This is how I have them set up on my the back of my liberty. Small switch in the rear so I can put light out the back when fishing and such.

Let me know if you have any more questions.

2005 Liberty, Lifted with "stuff"
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post #3 of 3 Old 06-19-2011, 03:11 PM
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1964 CJ5 
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Location: Littleton, CO
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That's one way. It uses the switch to operate the relay to bypass the normal reverse switch. Another alternative uses the switch to do the bypassing and the relay drives the lights always. This only requires the 4-wire relay you already have.

Run the reverse wire from the reverse switch to one side of your toggle switch. This wire will feed power to the switch when you are in reverse. Run a fused power source (you don't need much current here -- 1/2 amp is plenty) to the other side of the switch. Then run the center of the switch to pin 85 of the relay and ground pin 86. Connect a higher-current source (big enough to run your backup lights) to pin 30. Connect the lights to pin 87.

With this arrangement, the lights are always switched by the relay, so if you run bigger lights in back you won't melt the backup switch. I don't know about the legality of turning off the backup lights, so you might want to consider this when using a center-off switch.
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