EFI 15A fuse keeps blowing after lift runs for a while. Replace fuse and it immediately pops fuse when the key is turned to "ON". Let the lift sit for a day or two and replace fuse and the lift will start and run, but then pops the fuse when it gets warm. I have already unplugged everything on the circuit to check for short to power and ground; everything is within spec. Any advice would be appreciated.