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Tractor Talk Discussion Forum

OT/ Pickup Electrical Question

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DP

05-09-2007 08:50:47




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Does anyone know, or know where to find information on how many trailer lights can be hooked to the regular trailer lighting reciptical without causing problems. I just got a 2004 F-250 Crewcab Super Duty with factory hitch and wireing. I have a flatbed gooseneck trailer I'm sitting up to pull, and its 4 clearance lights down each side, 2 taillights, and a 3 light light bar on the rear. The pickup doesn't have rooflights, if that makes any differance. Thank You for any help you can give. I've looked at the owners manual and am more confused now. Don

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Bob

05-09-2007 21:18:53




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 Re: OT/ Pickup Electrical Question in reply to DP, 05-09-2007 08:50:47  
Use modern LED lights, and you'll have NO worries of excessive current PLUS they'll never burn out.



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dave guest

05-09-2007 18:49:50




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 Re: OT/ Pickup Electrical Question in reply to DP, 05-09-2007 08:50:47  
With trailer wiring I would be thinking about physical factors as well which would call for at least 14awg or e ven 12awg(size according to your connectors) Establish separate circuit for your lights and leave existing wiring alone. KISS



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Ludwig

05-09-2007 09:07:19




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 Re: OT/ Pickup Electrical Question in reply to DP, 05-09-2007 08:50:47  
The clearance lights are probably all 5w probably the same for the 3 on the rear, so 55w there. Tail lights are probably more, 10w maybe? Say 90w total to be safe. Thats ~7.5amps.
Chart I found online>Link
says>Link you'd need 18ga wire to carry that, in fact it says 18ga is safe to 10a. I *think* most trailer wiring is 18ga as is most truck wiring but check yours to be sure. Also check the bulbs in your lights to see what they draw.

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DP

05-09-2007 09:38:34




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 Re: OT/ Pickup Electrical Question in reply to Ludwig, 05-09-2007 09:07:19  
I built this trailer myself, and I will check, but I think its 16 guage at least. I set my old pickup up a little different. I had it wired through a relay with a seperate rocker switch. The way its setup, I am limited to what I can hook to. Would like to have this more universal for everything.



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Glenn F.

05-09-2007 09:38:07




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 Re: OT/ Pickup Electrical Question in reply to Ludwig, 05-09-2007 09:07:19  
Ludwig:

You may be right, but #18 is pretty light stuff.

In the case of original equipment #18 underground dog fence wire, I could skin/cut it with my thumbnail. I now have #10 burried.


Glenn



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Ludwig

05-09-2007 10:08:20




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 Re: OT/ Pickup Electrical Question in reply to Glenn F., 05-09-2007 09:38:07  
The chart says 18ga is good for up to 10a which in 12v is only 120w..
10ga, according to the chart is 100a at 12v or 1200w which is like running a hairdryer.

I'm not 100% sure how an underground dog fence works but I imagine it put some particular frequency through the wire that the collar responds to. In which case I'd expect it to be VERY low voltage and amperage. If you could cut the 18ga wire with your fingernail its cheap crappy wire. I've used alot of 18ga for speaker wire over the years and its way tougher than that. Don't use one example of cheap wire to consider all wire bad.

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