spraying the harness will not do anything, do like I posted earlyer and solder a buzzer or a light across one of your blown fuse's if you have a friend to see it go out, I like the buzzers because you can work alone, so keep the tester in the glove box and when it shorts out again pull over and put it in and look for you short, but while it is working now you can unplug stuff to see what all you need to unplug when it shorts out again, it is safe to do and you will only have like half an amp going through the harness.