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Old 06-05-2016, 10:35 PM   #11
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Kellseik,

I don't know if we read the same thread or not - but the one I read on an F150 forum was much more detailed.

On a 2015 or 2016 (and I assume later) Ford F150's here's the deal:
1) The Ignition must be "on" and the engine running (not just accessory).
2) The trailer must be "named" in trailer setup and selected
3) You must depress the brake at least once which is apparently when the onboard computer "senses" the brake lights and decides it is attached to a trailer.

Then and only then will you get charge current to pin 4.
Also, if you're looking at charts of the 7way connector - remember that it's installed upside down on a Ford. Pin 4 is bottom left, not top right.

There was also one poster that swore there was no voltage on the charge line unless the RPM's of the engine passed some point (he thought 1500 rpm). Nobody verified that.

Lastly - the "charge line" is a very tiny wire (like 8ga) and only supports .5a. In other words it won't really "charge" a dead or low battery and it certainly won't run something like a jack. It's designed (by an idiot who never owned an RV) to simply provide a trickle charge to "maintain" the RV batteries.

This is about the only thing about my new F150 I don't like.
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Old 06-06-2016, 07:58 AM   #12
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Quote:
Originally Posted by BuddyRay View Post


Lastly - the "charge line" is a very tiny wire (like 8ga) and only supports .5a. In other words it won't really "charge" a dead or low battery and it certainly won't run something like a jack. It's designed (by an idiot who never owned an RV) to simply provide a trickle charge to "maintain" the RV batteries.

This is about the only thing about my new F150 I don't like.
2x to the design issue regarding the charging wire used in the F150... so I just went out to the truck and checked what gauge wire is used between the breaker and the trailer connector. I remember looking at it a few years ago, and thought it was rather thin.. based on what I see this morning, it is more like a 12 or 14AWG wire... that will REALLY limit the charging capabilities of the F150/trailer.. I also noticed that the F150 seemed to ignore the TT batteries voltage level.

Guess, I will replace it with a 6AWG from the battery to the trailer connector and a 30amp breaker.

The one thing I did notice was that the F150 did not recognize the low voltage on the TT battery and step up the charging voltage (after truck engine was not on the initial higher voltage charge after starting). I tested it after running down the TT batteries to 12.1 volts, I started the F150 and the voltage was at 14.8 volts. When the F150 battery came down to 13 volts, I connected the trailer (with SOLAR disconnected) and the voltage at the F150 battery did not change (at all, and yes initially there was 14.8 on the trailer connector), making me believe that there may be a blocking diode in the trailer charging circuit to isolate the F150 from the trailer. With a diode in place, the F150 does not see the battery, but still supplies its current/voltage, based on the needs of the F150 battery. Yes, the trailer is programmed into the truck as EAGLE, and it does come up on the display, which confuses my blocking diode theory, although there may be other sensors working here. You would think that the 12.1 trailer voltage would bring down the F150 battery to an point between the 2 batteries, and the truck would raise the charging voltage. I will continue trying to figure this out, but it is not at the top of my priority list...

Don
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