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Aux backup light wiring questions

Old Mar 1, 2023 | 08:19 PM
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Aux backup light wiring questions

I have seen various methods to wire auxiliary backup lights. One method seems to be the simplest is to splice into the backup wire in the trailer harness directly. Several other methods add a relay controlled by the backup light harness but with the power coming from a line strung to the battery. I assume low wattage LED pods would not be an issue coming directly from the trailer towing harness.....?
 
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Old Mar 1, 2023 | 09:15 PM
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Low amp draw and definitely tap in at the trailer harness and not one of the wires to the brake lights (so I've read). I have (2) 6" oval white reverse lights tied in this way and they work fine. I was considering adding 2 more reverse lights into the mix and I don't foresee a problem.
 
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Old Mar 2, 2023 | 04:44 AM
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Do you have upfitter switches?
 
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Old Mar 2, 2023 | 06:58 AM
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I didn't want to splice or tap wires so I used this harness and a relay.
https://magnumtruckracks.com/shop/tr...ody-style-ford
Also used the harness to wire up a Center Dually running light.
https://www.tascaparts.com/oem-parts...RpZXNlbA%3D%3D

Lights wired to come on in reverse or by upfitter.
Also installed toggle switch as I only want the lights to come on in reverse when I'm plowing so in the summer I switch them off. Can still turn on via upfitter.


 
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Old Mar 2, 2023 | 11:33 AM
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No, I am a moron. I custom ordered the truck and did not include the $165 upfitter option. I was thinking about adding it now until I added up the cost.
 
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Old Mar 2, 2023 | 11:42 AM
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Can you explain how you did this? I am looking to do something similar for reverse lights.
Do you have a toggle for the lights to come on with the backup lights and you have the upfitter switch to turn them on whenever you want?
 
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Old Mar 2, 2023 | 11:46 AM
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Originally Posted by AMPNW
Can you explain how you did this? I am looking to do something similar for reverse lights.
Do you have a toggle for the lights to come on with the backup lights and you have the upfitter switch to turn them on whenever you want?
Yes exactly. Upfitter switch to turn on whenever I want.
Toggle switch on, lights come with backup lights, toggle off, lights will not come on with backup lights.
 
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Old Mar 2, 2023 | 06:10 PM
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Originally Posted by bigred460ci
I didn't want to splice or tap wires so I used this harness and a relay.
https://magnumtruckracks.com/shop/tr...ody-style-ford
Also used the harness to wire up a Center Dually running light.
https://www.tascaparts.com/oem-parts...RpZXNlbA%3D%3D

Lights wired to come on in reverse or by upfitter.
Also installed toggle switch as I only want the lights to come on in reverse when I'm plowing so in the summer I switch them off. Can still turn on via upfitter.
Not with a pre-made harness, but this basically is the same as I wire mine back in the days before upfitter switches. I could illuminate the back-up lights with a toggle switch I installed in the cab, and they'd illuminate with the back-up lights. I did not have the in-line shut-off for the automatic side, but I like that idea. Having the option for manual illumination is great for early morning trailer hitching and riverside driftboat launches, navigating dark driveways, and closing gates behind the truck after pulling through.

Last weekend I ran wire to the back of the truck from the upfitter relay bundle on my '22, but I've yet to decide what lights to get. I don't think I'm going to wire them into the truck back-up lights this time though.
 
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Old May 3, 2025 | 10:32 PM
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Planning this for my 03 F250, would someone be so kind as to provide me with details of how to do the rear spots with activation by switch and/or by normal backup light operation.

Thanks.
 
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Old May 4, 2025 | 10:30 AM
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I am in the process of my rear lighting/trailer lighting project.
I am using the reverse light override harness from Limitless Auto Works.
I will the ability to activate the reverse lights on the truck/any auxiliary rear lights and any lights for reverse lights for a trailer via an upfitter switch.

Full write up and photos will be coming.

ZooDad
 
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Old May 4, 2025 | 03:51 PM
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I just started researching this modification and have not started diagraming yet, so I am still looking into this. I did look at the Limitless Auto Works option but it does not appear to be compatible with the 03 model, or am I missing something?
 
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Old May 4, 2025 | 05:11 PM
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Nothing special when I added the reverse lights to the '16', it did not have upfitter switches. Habor frieght kit did what was needed.

https://www.ford-trucks.com/forums/1...l#post20669555
 
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Old May 4, 2025 | 07:14 PM
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A couple of years ago I picked up an F650 lower dash panel and a mounting plate (RiffRaff Diesel) and have yet to put it in. At the time I didnt have a need for added switches but figured I would eventually. I am not anxious to cut into my dash panel as it is black and I have not found many black panels, just the tan or grey, and mine is pristine. So the F650 lower dash panel was perfect for my future needs. Not sure I need to use 6 Carling rocker switches at this time, but I do have plans on adding an inverter that I would like to switch off/on as needed, and a few other needs, such as the spots for when I am reversing or hooking up a trailer at night, etc.

Thanks for the input.
 
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Old May 4, 2025 | 08:19 PM
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I added a pair of LED lights that come on when in reverse and I added a 2nd set of brighter LEDs to an upfitter switch
 
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