bosco500

We had a 90 minute race this weekend, and the 50a ignition fuse blew on the last lap. The motor is a B18C1 with a stock GSR fuse box under the hood. The car was towed into the pits, and I proceeded to change the fuse. As soon as I turned on the kill switch, the fuse blew again. I took a quick glance over the motor, under the car, and over the dash, and didn't see any burned wires. Anybody got any ideas? The car ran strong for 90 minutes. Thanks for any ideas.