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Old 12-31-2013, 09:10 PM   #1
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Auxiliary back up light QUESTION

So I'm wanting to add an auxiliary back up light...I've been reading and reading and reading to try and figure out the best way to go about it since this is my first attempt at adding wiring. I think I've pretty much got it figured out, but I do have a question or two.

I saw in one thread I was reading that a guy mentioned wiring the switch into the ground wire for the relay. I liked the sound of that. But this would mean the relay would constantly have power coming into it, right? Is that a problem at all?

And where is the best place to get the power for the relay from without splicing into anything?

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Old 12-31-2013, 10:54 PM   #2
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Anybody? Somebody? Help?

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Old 12-31-2013, 11:20 PM   #3
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Best power for your relay is the battery. Nothing better. Ground anywhere you got a good chassis ground. I ran my wire up into tub with taillights came in where they do then under carpet to front then battery.
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Old 12-31-2013, 11:26 PM   #4
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Alright, thanks! Any thoughts on the switch question?
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Old 12-31-2013, 11:43 PM   #5
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Wired them straight to the lights. They come on with the reverse lights. Same route up through the plastic bottom of the rear corners. Just unhook it. Then put it back. Same way you get to tub to run other all fine trough that plastic panel. I did mine driver side. It's best. Trailer plug in harness install for towing. go passenger.
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Old 01-01-2014, 12:23 AM   #6
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I gotcha. I'm wanting mine to be able to manually control mine though, so that's what I'm going for.
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Old 01-01-2014, 02:10 AM   #7
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I gotcha. I'm wanting mine to be able to manually control mine though, so that's what I'm going for.
If u have a open fuse you can do a fuse tap and get the power from there. Run the fuse tap to the switch ( where ever u decide to put it) the. Ground the switch ( if it has a light on the switch) and then run a power wire off the switch to the power wire on the reverse lights. Then you will have to ground the reverse lights and that's all u have to do!!! I can draw up a diagram if ud like but honestly you don't need a relay! Relays make it all complicated.
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Old 01-01-2014, 03:07 AM   #8
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If u have a open fuse you can do a fuse tap and get the power from there. Run the fuse tap to the switch ( where ever u decide to put it) the. Ground the switch ( if it has a light on the switch) and then run a power wire off the switch to the power wire on the reverse lights. Then you will have to ground the reverse lights and that's all u have to do!!! I can draw up a diagram if ud like but honestly you don't need a relay! Relays make it all complicated.
I would recommend using a relay..

The standard electric system are designed for the stock lights, and nothing more.. If you run the lights of the stock electrical system, you stand a change of melting the cables, giving you much more issues n trying to resolve it...

Adding a relay is very simple, rather safe than sorry!!
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Old 01-01-2014, 08:14 AM   #9
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I can draw up a diagram if ud like but honestly you don't need a relay! Relays make it all complicated.
If he's wiring in LED lights then you would be correct, but anything that will pull a decent amount of current will need a relay.
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Old 01-01-2014, 08:23 AM   #10
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Relay Diagram

Here is how you wire relays to power accessories.
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Old 01-01-2014, 08:53 AM   #11
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It's not a very powerful light. Bulb says it's like 35W, so that would mean it draws about 3 amps, right? In any case, I'm going to use a relay because at some point down the road I will be adding bigger lights so I might as well throw in the relay now and be safe.

My last question though, referring to that diagram ^^^, is there any reason why I shouldn't/couldn't move the on/off switch from the right side of the relay like it is, to the left side and wire it into the relay ground wire?
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Old 01-01-2014, 09:49 AM   #12
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It's not a very powerful light. Bulb says it's like 35W, so that would mean it draws about 3 amps, right? In any case, I'm going to use a relay because at some point down the road I will be adding bigger lights so I might as well throw in the relay now and be safe.

My last question though, referring to that diagram ^^^, is there any reason why I shouldn't/couldn't move the on/off switch from the right side of the relay like it is, to the left side and wire it into the relay ground wire?
I do not know if it matters but why do you need to do that?
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Old 01-01-2014, 10:23 AM   #13
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By switching the relay coil ground you don't have a hot wire inside can especially useful with high power fog lights or driving lights as one fused hot for both relay coil and power lights all in new harness under hood and just a wire from ground to switch behind dash and only a control wire grounded by switch thru firewall. To ground relay coil

It also gives option of running hot to driving light relay coil from headlight high or park light so can't accidentally leave on just driving light unless you left on other lights
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Old 01-01-2014, 10:27 AM   #14
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Someone mentioned that doing it that way keeps the constantly hot wire out of the cab. If you run the ground wire inside, it would only be hot when you have the switch turned on.
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Old 01-01-2014, 10:51 AM   #15
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It is never hot only grounded when you turn the switch on and a short to ground just turns the light on
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Old 01-01-2014, 10:54 AM   #16
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The other nice thing if you run the relay positive coil wire of current back up light positive they only come on if switch is in and back light lights are on so cannot accidentally leave them on yet control by switch so don't come one every time you pit it in reverse like if you back up with a cop around

Down side is tranny must be in reverse to turn them on
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Old 01-01-2014, 11:20 AM   #17
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Here's a diagram I drew up when I was thinking about adding some to my "99". I was plannig on putting the relay in the rear cavity of the tub behind the tail light.
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Old 01-01-2014, 12:39 PM   #18
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It is never hot only grounded when you turn the switch on and a short to ground just turns the light on
But when the switch is on even the ground will have 12 volts won't it?
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Old 01-01-2014, 12:45 PM   #19
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Here's a diagram I drew up when I was thinking about adding some to my "99". I was plannig on putting the relay in the rear cavity of the tub behind the tail light.
That's pretty fancy! And a good diagram--easy to understand.
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Old 01-01-2014, 12:51 PM   #20
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Also, so the answer to my question is that it's perfectly fine to run the switch on the ground wire? What do you think Water Dog? You seem to have an understanding of this stuff lol
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Old 01-01-2014, 01:15 PM   #21
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Also, so the answer to my question is that it's perfectly fine to run the switch on the ground wire? What do you think Water Dog? You seem to have an understanding of this stuff lol
There's no problem running a switch on the ground side, that's the way your dome and entry lights work.
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Old 01-01-2014, 01:42 PM   #22
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Alright. Thanks everyone!
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Old 01-01-2014, 04:04 PM   #23
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No if the switch has one side to ground and other side to coil in relay it will never have positive 12 volts

When it is on its output will be grounded

Same as your headlight ground when you turn on headlights the ground wire is still ground the voltage change is across the resistance in the headlight case the filament in the relay case the relay coil is the resistance but ground is ground Is ground

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