Hey guys, Thought you RV guys might know the answer here,,One of my hobbies is RC Model airplanes, I built a extension harness that takes power from the 7-pin connector so I can use the 12v. for my charging equipment at the field. This works perfectly on my '02 2500, but I can't get it to work on my '04 suburban I recently bought. I've tried engine running, ignition on and off, I don't get power back there, The 30a fuse is good and in place for the aux tab that powers the trailer harness, What am I missing? Thanks

Did you put in the maxi fuse under the hood? Is the ground ok at the 7 way?

corrosion: first thing I would check for. I've had to plug in and out several times (and improving continuity by scraping) these connections before.

stew47 wrote:Did you put in the maxi fuse under the hood? Is the ground ok at the 7 way?Fuse is OEM 30aLights and brake controller work fine,, so I'd say yes.

JPeyton wrote:corrosion: first thing I would check for. I've had to plug in and out several times (and improving continuity by scraping) these connections before.Tried that, contacts are pretty clean, My Buddy at the flying field has a '06 Suburban, same issue when testing it on his truck

When I got my 2010 Ford truck it did not have 12VDC at the 7-way connector as well. Then I found an unmarked envelope in the glove box that had a fuse and relay in it. No other information whatsoever.Scanning through the truck manual I found mention of TRAILER CHARGE or something like that and it identified a fuse holder and a relay spot in the main fuse panel under the hood.. Turned out this was the place where the items in the envelope were to be installed. With these two items installed then I had 12VDC on BLADE 4 of the 7-way connector when the ignition key was turned ON.Roy Ken

'04 Suburban (power at the trailer connector) | Good Sam Community

RoyB
Explorer II
May 28, 2015
When I got my 2010 Ford truck it did not have 12VDC at the 7-way connector as well. Then I found an unmarked envelope in the glove box that had a fuse and relay in it. No other information whatsoever.

Scanning through the truck manual I found mention of TRAILER CHARGE or something like that and it identified a fuse holder and a relay spot in the main fuse panel under the hood.. Turned out this was the place where the items in the envelope were to be installed.

With these two items installed then I had 12VDC on BLADE 4 of the 7-way connector when the ignition key was turned ON.

Roy Ken
TReiner
Explorer
May 28, 2015
JPeyton wrote:
corrosion: first thing I would check for. I've had to plug in and out several times (and improving continuity by scraping) these connections before.

Tried that, contacts are pretty clean,

My Buddy at the flying field has a '06 Suburban, same issue when testing it on his truck
TReiner
Explorer
May 28, 2015
stew47 wrote:
Did you put in the maxi fuse under the hood? Is the ground ok at the 7 way?

Fuse is OEM 30a

Lights and brake controller work fine,, so I'd say yes.
JPeyton
Explorer
May 28, 2015
corrosion: first thing I would check for. I've had to plug in and out several times (and improving continuity by scraping) these connections before.
stew47
Explorer
May 28, 2015
Did you put in the maxi fuse under the hood? Is the ground ok at the 7 way?

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'04 Suburban (power at the trailer connector)

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