P15-D24

'09 with max tow. Is the circuit maker "+" on the connector hot all the time? I have never used my 7 pin connector but when I checked it with a VOM I got no voltage with the key on or off. Some diagrams call this circuit "battery charge" and was wondering if their was something need to do to make this circuit "hot"?

jdtech65

In order to make the battery feed hot at the 7 pin you need to install the fuse and relay that are in the bag in the glove box. I don't know why Ford doesn't just install these at the factory but its pretty simple. You'll just have to look in the Operators manual to see which one they go in cause I don't remember.

Whizbang

jdtech65 has it right.

After you install the fuse and relay, the + line will charge a battery at a rate up to 11 amps.

Abn150

The relay goes in position #9 and the 30a fuse goes in #21. In the main power box under the hood, not in the fuse box in the passenger compartment.

johnwill

abn150man is right on with this info, thanks!

I only know it too cuz I needed to figure it out when I installed a Recon light bar that required that constant 12v. Was head scratcher for the me until I read here from some guy that had already been there, done that. Perfect reason why this forum is great!

RadioMan

Well that bag in the glove box with the relay
and fuse that was SUPPOSE to be there when
I picked up my 2010 was missing.

The stealership told me that I was to pay them
$30.00 for the relay and they would have to order
it.

I contacted Ford about it and they turned it over
to the stealership. The stealership never made
contact with me.. So much for Fords PR.

You really don't need the relay at all if you want
power to that pin all the time. I just made up a
jumper. I installed a fuse in the proper socket and
I was in business.

It's easy and safe to do as long as you use the proper
fuse size. I also made up the jumper using #10 wire
and spades on each end just like the relay has.

P15-D24

Checked everywhere in the truck today and no relay. Just to confirm, if I do the jumper in #9 is it hot all the time?

Niceguyinsanjose

I just installed the fuse and relay as instructed above, but still no 12v+ to the center pole of the 7-pin connector.

I checked all the connectors and the fuse.

Any suggestions?

ReducedBoost

What triggers the mentioned relay? (Truck being on, trailer connected, etc..)

Niceguyinsanjose

I don't have a clue... But I am trying to power a white night backup light... And their instructions, and everything else I can find, say the center post should be always hot.

So, I don't know if anything should be necessary to trigger the relay.