I got excellent advice last time I was here so I figured why go anywhere else. Here we go, its an 08 sierra SLT that blows a fuse that controls the rite side windows, seat heaters, and seat controls. Sometimes it will last a few days and others it blows rite away. Has anyone experienced this? Is it common ?

if its not doing it when you use the device on the circuit its a wire touching the ground somewhere

Is there a way to isolate the prob to a specific circuit?

not as easy. the wires go to the things you mentioned but are likely spliced in some inaccessible area of the dash or under the carpet. i think i would start under the fuse box, there are a ton of wires and a bit of extra wire make sure you take the positive lead off when doing this

what about going from a 20 to a 25 amp fuse? 5 over won't hurt anything and if it still goes then I know I have a real short. What do you think?

you never go up in fuses, they design the circuit the very least size wire they possibly can. that will start a fire where your short is.

if you can find a spot where it is easily separable you can put the original size fuse in and if it pops after you isolate part of the circuit you know its before that

Divide and conquer. I'll try that

It'* the negative lead, FYI.

doesnt matter in a dc circuit. if there is a load it will arc the same no matter which side you pull.

This is true. I was just regurgitating what I learned from working on AF Comm systems and my auto electrical class.

The basis being that the theory is that power flows from positive to negative, whereas in automotive power flows from negative to positive.