with those fuses don't be fooled by an optical check do a resistance check 0 Ohms across the blades
Too right: I was fooled by a blown fuse that "looked" OK, but worse: fuses can measure correctly with a meter when out of the fuse box, but when under load a crack opens and the circuit fails.
In my case I ended up trailering the roadster to Williams when the cause was a blown fuse. Expensive.
The moral of my exensive fiasco? IF IN DOUBT REPLACE THE FUSE!!
now that was an expensive fuse 
