I am thinking you are on the right track with it being wiring, you should also be losing the instrument panel cluster as well, it is on the same fuse. The ignition switch could be a source of power loss, but to blow a fuse is unlikely. The trans fuse is supplied its power in run from the ignition switch on the white wire circuit 1390, it is shown as a stand alone circuit for the trans fuse. After the fuse the circuit splits(circuit 1020 pink wire) and goes to the cluster and the transmission. You could have a short in the wiring, or possibly a shorting solenoid. One way to determine which area of the circuit to focus on, would be to install inline fuse holders in each branch of the circuit, using lower rated(7.5, or 5) fuses than the 10 amp trans fuse. When the fault occurs, it would be narrowed down to a branch of the circuit.
Wednesday, March 10th, 2010 AT 11:52 PM