auxillary back-up lights
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Joined: Jun 2004
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From: Washington, West Virginia
auxillary back-up lights
Does anyone know which wire is for the reverse lights to hook up my auxillary lights so they will come on when i am in reverse.........04 F350 SRW
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From: Utah County, UT
If you have the tow package, pull from the trailer plug it is the center plug (7 pin). This will eliminate the extra draw and prevent blowing the fuse under the dash, the trailer plug is also fused as well. This is the way that I have hooked mine up, I also ran a wire from a switch in the cab to turn the lights on as well.
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From: West Virginia
carbine 1, I hooked mine up to the trailer connecter, black with purple strip I believe. It works great. You can look in my gallery to see how I mounted them.
Fitter
Fitter
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Tuned
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I tapped the reverse lights on mine but I used a relay to prevent the extra load cangim is talking about. The lights get their power from the battery but only when the reverse lights activate the relay.
Scott
Scott
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From: Michigan
i wired mine up independently of the reverse lights for plowing. That way i can choose when to have them on. With my side lights, head lights, and reverse lights it looks like a space ship is landing when i plow. 
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When you connected them this way do they come on when your in reverse? Or do you have to switch them yourself?
Originally Posted by fitter565
carbine 1, I hooked mine up to the trailer connecter, black with purple strip I believe. It works great. You can look in my gallery to see how I mounted them.
Fitter
Fitter
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From: US
In my old truck i burned up a bunch of wireing overloading the backup circuit with a set of tractor 5" headlights on the under the back bumper. it fried the neutral safety switch. Not shore if the superduty wireing is heaver than on my 94.
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From: Cabot, Arkansas
Originally Posted by Fieldday
I thought the center post was a constant on for battery charging and interior lights in a camper/trailer?
As far as being "constant on", it depends on the installation of your truck's 7-pin. My 2001 SD came with the "tow package" and had the 7-pin installed at the factory. Both the trailer brake line and the trailer charge line have relays which open when the key is off... This is to prevent these two lines from being "constant on" as you say and draining your truck's battery while parked.
However, an aftermarket installation could result in a constant 12v supply to these lines and risk a dead truck battery if left connected to your trailer overnight.
To the original question, I understand the Ford factory 7 pin uses the center (#7 pin or Aux) to provide reverse lights for trailers so wired. You could easily tap into this source and have reverse light power independent of your truck's reverse lights. As Cangim said above, this would reduce the chances of your aux reverse lights overloading your truck's reverse lighting system and all of them would still come on automatically when backing.
See the link below for a diagram of the 6 & 7-pin connectors.
Some Chevy Guy's 7 pin diagram
Edmo
Last edited by Edmo; Jul 3, 2004 at 11:52 AM.
