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Discussion Starter · #1 ·
I have a 2012 F350 dually I pull a 40' fifth wheel RV with. I purchased a Viair 300P portable compressor to use to inflate air hitch and air pinbox on camper. I would like to use a 7 way plug adapter to get power from rear, instead of connecting to battery way up front. Problem is, Ford only uses a 25 amp fuse for this circuit and compressor may draw a max of 30 amps. Do I dare change that 25 amp out to a 30 amp in the distribution box under the hood or do I need to find another idea ?
 

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Personally, I would run a dedicated circuit from the battery junction to the rear of the truck and with at least 10 gauge wire that can fused at 30 or 40 amps.
 
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Not sure if this will work for you but, I have the 400P-RV which uses the same air compressor and I use the batteries in my 5th wheel to clip on.
 

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I definitely wouldn't change the fuse. You could burn up wire, fuse block, or other electronics if too much current is drawn (over what the parts are designed for). You could run a new wire as recommended, or to start with just run it off the 25 amp circuit and see what happens. Often the rating is a max current draw but actual running amps are less. Then if it does draw too much it should just pop the fuse and protect everything else ( I say should because it is possible that the fuse doesn't blow fast enough and you still might get some burning but unlikely.)
 

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I've been looking at these myself; particularly the 400P-RV Automatic Compressor. According to their website, they require 30 amps and must be connected to the vehicle's battery, with the vehicle running, to work properly. According to their rep (I called them), if these high capacity compressors are hooked only to a battery, with the amperage draw, they will deplete the battery very quickly. Also, as the battery depletes, adequate power will not be provided to the compressor. I was inquiring about using it for 80 PSI truck and rv tires where the pump may have to run for 10-15 minutes or longer. I'm sure that you could run a heavy gauge wire, with proper fuse, to almost anywhere for power, and keep the vehicle running while using it, but the hose is adequate for reaching any tire on the vehicle. And, to reach rv tires, an extension is available for purchase.
 

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After reading Clev post I realized it was portable. Maybe a disconnect like Warn uses for their portable winches?
 

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I tow a dump trailer a lot. I've found I have to disconnect my dump trailer while I operate the hydraulic ram. It pulls too many amps. If the trailer battery is low and I try to lift the bed, it pulls off the truck and blows my fuse.

And it's a pain to try and get into that fuse panel under the hood and find and replace that fuse.
 

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Discussion Starter · #9 ·
Thanks for the great idea Sportscraft. I was thinking of mounting a second set of battery posts in the rear, but I like your idea better!
 

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Well, I got myself the 400P (not RV) for Christmas and tried to air up all tires a few pounds. Wow! I was impressed; this thing really works as advertised. Also, the manual specifically states that the engine should be running or there is danger of depleting the battery. After using it, I can see why; this is one powerful compressor.
 

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Clev where did you get yours and if you don't mind me asking how much was it?
 
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