Quote:
Originally Posted by particlewave
Yes and no. A test light is insufficient as you’d need to see the voltage drop from one side to the other to give an idea of resistance. You’d be surprised at how much a small voltage drop (slight increase in resistance) can affect some electronic components. 
I just went through this yesterday with my sons friends car. Car wouldn’t fire, we determined that it wasn’t getting enough fuel, then tested power at the fuel pump. It was at 10V. Replaced the good looking fuse with new and it fired right up. 
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Interesting. I thought fuses were either good or blown. I've never had such experience as you did. Unless there was a problem with the contacts. Did you try re-inserting the same fuse?
Either way, good to know!