fuse for 12v outlets keeps blowing

[RustyShackleford]

The fuse which feeds the 12v outlets in the console and in the rear

cargo area seems to keep blowing. I have one of those piezo-electric

coolers plugged into the rear. I guess it's either a short somewhere in

the wiring, or the cooler is somehow presenting too big a load (or has a

short circuit). I kinda doubt the latter, because I ran the same cooler for

years in my old '97 and the fuse only blew once. The cooler is not

supposed to use anywhere near 20 amps, but I replaced the fuse with

a 25 amp (I know, not a great idea to put in a bigger fuse) and it still

blew; so if it's the cooler, it's a short and not too heavy a load. I guess

I can just try running it awhile without plugging in the cooler at all and see

if it still blows.

 

Assuming I conclude it's the car wiring and not the cooler, and ideas for

how to track it down ?!?