The fuse part is bs because the tamiya has higher resistance eg higher voltage drop across, leading to less amperage for the motor and fuse.
Your thinking backwards there Icorus. Ohms law: IxR=V | V/I=R | V/R=I | (V=volts, R=resistance, I=current/amps)
Lets say his battery is providing 10v for ease of explanation and comprehension.
And his Tamiya plugs are creating a poor connection with 2 ohms of resistance. (a poor connection will usually be less than 2 ohms, but 2 is easier to see the side effects, so we will use that)
And his motor pulls 10 amps normally.
In short, as the tamiya connector reduces voltage from resistance, it causes the motor to pull higher amps due it having lower voltage to work with, which can be enough to blow a fuse simply from the voltage drop across the connectors. If you want a more detailed explanation, send me a PM, and I'll write a separate post about it later today if I get time.