240sx_fanboy

As title states I have a s14 with and s13 sr
Swaped two - three months ago (by previous owner)
The problem is that about a week ago the meter fuse start popping.
Iv been looking for the short all day and Came up with nothing.
The situation as follows.
The oil light is on (oil is fine) but it's only on when the car is off or meter fuse blown.
The fuse usually blows when I hit a bump.
I checked the wheel well harness all is fine and tucked far from wheel.
Also there is about 1.4 volts going though the fuse with the car off from the wrong side.
Thanks for your input in advance.
Any tips pointers or clues are appreciated