Sort of OT, Farm pickup

MoMike · Mar 2, 2016

I have a new to me 2004 F-250 that we use for pulling a gooseneck trailer. I am having a problem with the wiring. We rewired the trailer the other day and had full lights working at the end of the pigtail. Hooked the truck up to the trailer and had clearance lights but no turn or brake lights. Now I have no turn or brake lights at the pigtail. Still have everything on the truck though.
Is there a fuse or something elsewhere than the fuse block under the dash, or am I missing something in the fuse block (another circuit I missed). Thanks in advance.

old popper · Mar 2, 2016

My '05 F-250 has a fuse panel under the hood to cover the trailer circuits.
Hope this helps.

ss55 · Mar 2, 2016

If possible, first I would try a different truck on the rewired trailer or try the new truck on a different trailer to see if the problem stays with the truck, the problem stays with the trailer or if both have a problem. It seems to take me ten times as long to debugg multiple problems compared to solving a single problem.

FLOLDFORD · Mar 2, 2016

I don't think it's a fuse problem. I have a 03 250 and the only time it blew the fuse under the hood I didn't have anything at the plug. I have had problems with the plug at the back getting corroded and not making a good connection

robgIN · Mar 2, 2016

look in the owners manual most of them have separate fuses for trailer lights .

farmboy48 · Mar 2, 2016

had the same trouble with my 08 f-250, had to replace the fuse under the hood on the left side. Make sure the trailer lights are wired right first, or it will just blow again.

MoMike · Mar 2, 2016

I know this is going to sound dumb, but can you locate this for me. I'm not seeing a fuse block (or what I think one should look like)in the engine compartment, at least on the drivers side by the firewall. Thanks

Dick L · Mar 2, 2016

Take a probe test light and check the plug at each terminal after you turn the signal on left and then right. If every thing works on the truck it should not be a fuse. I have always wired the truck to the diagram on the plug box and then wired the trailer to match the truck checking with the probe test light.

rrlund · Mar 2, 2016

Do you have the manual? My 07 has the fuse box for the trailer under the hood too. Drivers side. If memory serves me right,it lays flat with a cover over it. Can't help you any better than that without getting dressed and going out to the garage to look.

MARK ROBKE · Mar 2, 2016

It's under a large plastic cover that you have to unsnap(very easy).Might have a lightning bolt across the top of it,on the left I believe.Mark

Bob Harvey · Mar 2, 2016

PLEASE don't tell us you where nekkid when you posted ! !

old popper · Mar 2, 2016

It is on the drivers side just ahead of the firewall, but is called the power distribution box.
I'm not sure if it has a diagram inside the lid or not. I have the book for mine.

old popper · Mar 2, 2016

I did throw on a coat and went out to look. Also brought the "Owners Guide" in with me.

old popper · Mar 2, 2016

I just checked "the map" to se where you were located. I've been to Conway, went to Two Cyl Plus Salvage a few years ago to get some pulling parts for my G.

rrlund · Mar 2, 2016

Why not?

oj · Mar 2, 2016

Check the plug on the back of the trailer connector (truck side) mine works a little loose once in a while and then I lose marker lights but my stop/turn lights still work.

JD Seller · Mar 2, 2016

The trailer fuses are under the hood. It is the square looking box to the left of the brake fluid reservoir. There are latches/clips on each end and the cover comes off.

jon f mn · Mar 2, 2016

Are you sure you wired the teailer plug correctly? The wire colors do not match up to the colors on the plug, that is if your trailer is wired correctly.

John M · Mar 2, 2016

Kida sounds like a ground problem to me.

504 · Mar 2, 2016

On some of the Fords you must have the key turned on for the the lights to work. Just something to check.

hd6gtom · Mar 2, 2016

Have you got one of those adapters plugged into the back of the truck and the trailer plugged in to that? Some of them were wired wrong inside the adapter. I have have had to take several of them apart and wire them correctly.

LarrySTN · Mar 2, 2016

Was this truck built with a trailer socket? I'm thinking built-in sockets were standard by 2004. I had the same problem a few years back, I found the problem with a bad turn signal switch in the steering column.

4play · Mar 2, 2016

Fuse number 6, 20 amp rating in the central junction box. This is the fuse box behind the dash panel under the steering column. Remove that panel using a coin or flat head and then you will see the fuse box. Fuse #6 is what powers the LH and RH turn relays for the trailer wiring, this is also the circuit for the brake lamps. The relays are what is in the little box under the hood that was pictured in a previous post, its a relay box, not fuse box in the pic.

I would check the trailer lights and wiring real good if you are blowing this fuse.

Robert Major · Mar 3, 2016

Hi Like others said with the fuse box under the hood, I had a customer here with the same problems on a 250. But if you replace those fuses and it keeps blowing them check the wiring loom under the truck. Mine is a 99 f250 with factory trailer wiring. there was a spot were the harness had rubbed the frame, a whole mess of the last guys botched repairs. Also there was some spots where the road gravel had eaten the protective loom cover and insulation off the wires, maybe something there is touching ground sometimes. In the end with mine I cut about 4 ft off the loom at a good spot . I then made good soldered/heat shrink connections, and used a proper sealed semi trailer junction box mounted to the box rear cross member up under the back, and used heavy duty wire with added plastic covering to run the rear plug and the one in the bed for goose necks. it's been nearly 4 years and it's still working good.

Also check the wires on the trailer real good if you haven't changed them. I have seen guys have problems they couldn't find. I went to it and pulled the slack from the wire where it came through a hole in the frame. Then found a bare wire that's rubbed or the insulation's breaking down, just inside the frame where you couldn't see it at first glance.
Regards Robert

MoMike · Mar 3, 2016

Thanks guys. I'll check them out tonight. I looked at that box last night before I posted but wasn't sure so left it alone. The fuses in there are about 1/2" by 1" with a diagram on one side, correct. #6 fuse in the cab box is fine (according to the tester), just have no power at the pigtail. Have I mentioned I hate electrical issues on vehicles. Thanks again.

showcrop · Mar 3, 2016

Do yourself a favor and get one of those little gadgets that plugs into your truck's plug and has the little lights that light up when your truck energizes it.

GVSII · Mar 3, 2016

Possibly a fuse or trailer tow relay under the hood,left side near the firewall.Are you using a dedicated ground between the truck and trailer.The hitch ball doesn't work that well as a ground.

Anonymous-0 · Mar 3, 2016

(quoted from post at 22:28:41 03/02/16) Take a probe test light and check the plug at each terminal after you turn the signal on left and then right. If every thing works on the truck it should not be a fuse. I have always wired the truck to the diagram on the plug box and then wired the trailer to match the truck checking with the probe test light.

[b:0ebf86f700]This should be your very first step.[/b:0ebf86f700]

Sort of OT, Farm pickup

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