My CRD has the towing package and 7-pin plug in for trailer lights, etc. The trailer I'll often be pulling has a small 6V exhaust fan I'd like to be able to run off the battery when I'm stopped. Currently it doesn't work when I plug it in. I've done some searching around on this site but haven't found any help so far. Can someone point me in the direction of where the fuses are for this and/or a schematic that would help me figure this out? I've had it done previously on other vehicles and apparently it was quite simple.

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2005 CRD Sport
Samco hoses, GDE Ecotune, Fumoto drain valve
Winter mods: air box snorkel removed, front grill covered, viscous fan and clutch removed

I don't think Pin 4, Aux power is wired or fused, but that is what you would need.

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2005 CRD "Ol' Blue"
Red Ryder carbine-action, two hundred shot range model air rifle with a compass in the stock and this thing which tells time.
My build page- RL Komodo Rear and TJM Front Bumper, armored, lifted, JBA Steel D30, 4.10s and ARB air lockers.

Hmmm, so that means I'd have to run a new line? Would that tie into the 7 pin, connector, maybe in place of the trailer brakes?

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2005 CRD Sport
Samco hoses, GDE Ecotune, Fumoto drain valve
Winter mods: air box snorkel removed, front grill covered, viscous fan and clutch removed

I cannot speak to the 7 pin connector but if you want to run that fan when stopped (be careful not to drain the battery) you will need 1) hot all the time 12 v power and 2) a ground and 3) a switch to turn the fan on/off. I suspect the standard trailer ground will suffice for #2 but you will likely need a new wire for #1.

The lazy approach would be to wire the fan directly to a cigarete lighter adapter with an intermediate quick disconnect plug to act as a "switch" and run the fan off the power adapter port in the rear gear compartment assuming you have that port.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

The trailer brake line is already run and can be found under the plastic trim piece next to the drivers left foot. there's a how-to for trailer brakes here somewhere that identifies that line. Mine had a paper label on it.

I haven't looked closely at my socket to see if the pin for aux power has a wire coming from it.

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2005 CRD "Ol' Blue"
Red Ryder carbine-action, two hundred shot range model air rifle with a compass in the stock and this thing which tells time.
My build page- RL Komodo Rear and TJM Front Bumper, armored, lifted, JBA Steel D30, 4.10s and ARB air lockers.

The fan has an electric switch in the trailer, you just reach inside and turn it on. It uses very little juice, we've had it running for 2-3 hrs with negligible battery drain and the vehicle starts just fine, and that's as long as we'd ever need to use it.
On my current F150, I just stopped into the local dealership pulling the trailer and they reportedly just switched a fuse and were able to get the fan to work withe vehicle off. Apparently it won't be that simple this time?

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2005 CRD Sport
Samco hoses, GDE Ecotune, Fumoto drain valve
Winter mods: air box snorkel removed, front grill covered, viscous fan and clutch removed