I have the factory 7 pin connector on my 2004 fx4. Everything works on my trailer (brake, turn, running lights) but for some reason I dont have 12 volts coming to the pin for aux power. This has never been an issue but im looking at getting a toy hauler and I assume I need this for electric brakes. Is there a fuse or relay that does not come from the factory that I need to install. I have looked in my manual but it looks like I have all my fuses covered.

 

Ford puts 2 fuses in the glove box that someone must install if wanting to use all 7-pins.

Also, TH = 3/4+ ton truck. 1/2 tons just don't have the payload.

 

The factory doesn't install the relays - they are packed in a plastic bag in the glove box.

https://www.f150online.com/forums/to...locations.html

 

Why would I need a 3/4 ton. The toy box is only 5k, I can tow 8800

I dont have any relays in my glovebox is this something I can get at autozone? Or do I need a factory part?

 

Get an electronic flasher and replace the old thermal flasher with the new one. Should be up under the dash

 

I see you already checked the fuses - also check the relays. They are also in the owners manual.

You can only tow 8800# if none of the other ratings are exceeded, which does NOT happen in the real world. If you are 5k fully loaded, okay - unless you load up the bed and cab too.

 

If you have the two relays (that's what I meant, not fuses) circled in pink in GLC's link, then they may need to be replaced. Ford dealer will have them, not sure about auto parts stores.

I can give an example how a brand new 2009 F-150 with supposed 11.3k tow rating cannot legally tow anything with four 200 pound people in the cab.

Toy haulers are heavy in order to carry the extra weight of the toys. They also have a higher percentage of unloaded tongue weight than regular RVs as the toys usually go behind the rear axle to help with the balance. 5k unloaded weight rating can easily be 8k pounds ready for a weekend of fun. Since bumper pull trailers tend to tow best with 10-15% of tongue weight, that could be 1200 pounds. You probably only have 1400-1600 pounds of payload available, which means you and maybe one friend can sit in the cab with nothing in the truck bed.

See how an extra 1000-1400 pounds of payload of a 3/4ton truck is required to keep the tow vehicle under its GVWR? Your tires will have an impact on performance as well, both is reducing your effective gearing and a more weight to turn.

 

An extra 1000-1400 pounds of payload? Obviously you haven't actually looked at any F250s. My F150 had a payload of 1600 pounds, my F250 2200 pounds.

Can he tow a toy hauler with his F150? Yes. Can he do it without exceeding any of the weight ratings? Possibly. You can't say for 100% certain one way or the other. Your recommendation that everyone tow everything with a 3/4 ton or larger truck is counterproductive, and shows how little you truly know about towing.

 

I'm guessing your F250 only had a GVWR of 8800lbs There was/is also the option of a 9600lb option in the F250's.

There is some wisdom here on this board... don't dismiss someone because they may or may not agree with you.

Heavy towing is best left to riggs designed to tow heavier loads, like the F250 and up. Of course there has been in the past a Light Duty F250 7 lug.. rememeber those? That were really just a beefed up F150.

Heavy in my definition is anything over 5000 lbs.

Will the 150 tow heavier than that? You bet!

But very poorly compared to a newer diesel larger truck like the 250 and 350.

Lots of people mention weights that can be easily exceeded when towing.
GVWR or GRAW
It happens. The problem is most don't weigh their loads and their truck and have no idea what their load really weighs.
Manufacturer's have also started a "Mines better than yours" attitude in sales and started raising published tow ratings.

Does this mean you can do it?
If you are close to your published tow ratings you better check everything out carefully to make sure you haven't exceeded any rating. Not just for warranty purposes, but if you are involved in an accident, you could become liable because of negligence civilly and criminally..

 

Nope. It has a 9600 lb GVWR and the camper package, but still only a 2200 lb payload. On top of that, it's only an XLT. Imagine how much lower a loaded lariat or KR would be.

And the F250 and F350 tow 10k pounds poorly when compared to a Freightliner.

My point is don't automatically dismiss someones towing setup because you can come up with a scenario where they might exceed one or more of their ratings.

Safe towing is about more than just the numbers. Someone with years of towing experience that might be slightly exceeding one of their ratings is far more safe than the clown that just bought a new F250 and TT, has zero towing experience, and takes off down the highway with the cruise set on 75.

 

The 2004 + MY trucks ( excluding the 2004 Heritage and Lightning ) have all the fuses and relays installed in the CJB ( aka Central Junction Box / passenger compartment fuse panel ) from the factory, unlike the 97-03 MY trucks ( and I would guess the '04 Heritage and L ).

If you do not have power at the trailer tow battery charge pin, that is Fuse # F106 and Relay 05 that control that.

I see a post about how you checked the fuse F106, how did you check the fuse ?

Are you are testing the trailer tow battery charge circuit with the key in the run position ?
It is only hot with the key in the run position, accy will not activate power to the 7 pin trailer tow adapter.

If you pull Relay 05, you can test Fuse #f106 to the relay by testing with a meter the pin connected to it.



Terminal 30 to ground with a meter ( ground lug in the lower right hand corner of the fuse panel ) should have + 12 V on it, if not, Fuse 106 is bad.

If you want to test the wiring to the trailer tow 7 pin adapter, jumper in the relay socket as shown above, and this will put +12 to the 7 pin trailer tow adapter without the key in the run position requirement.

 

Im pretty sure the problem is that im missing the relay for the "trailer tow/battery charge"

As far as the towing goes I appreciate all the advice from everyone. I think I will be ok. I will be towing about 6500 with a WD hitch, brake controller, and only about 500 lbs in the cab.

 

My problem is that OP doesn't know how much payload he has, as it sits in his driveway. Most people don't. Most people underestimate weight of their tow vehicle, trailer, and tongue weight.

AXFX4, what trailer are you interested in and what toys are you planning to put in it? I'd also weigh your truck to so know where you fall with respect to available payload.

HWM3, your 2200 pounds is still 1408 pounds more than this F-150, but less than some 8200GVW F-150's. That is counterproductive for OP as well. If the 2200 pounds is enough for you, great! It would probably be good for OP too, but he doesn't have it.

BTW, I don't recommend towing everything with 3/4+ truck. I recommend people research before spending $20k or 30k on a trailer or $70k on a new truck/trailer combo.