I just bought a 700 watt power inverter. I have a 500 watt power supply for my computer. I ran one 8 guage wire to thebattery and i grounded another 8 guage to the chassis of the vehicle. Anyways i turn on the power inverter then i try to turn on the power supply for the computer and the little red light starts blinking and the power supply doesnt turn on. I then connected a much smaller 200 watt power supply and it worked fine. My question is do i need to use bigger wires or is my power inverter messed up? Also should i have a fuse on the line going from the battery to the power inverter? By the way i know 500 watt power supply works because tested it in my house. Thanks in advance for your help.