It's not just MGs, my Triumph Spitfire also had an unfused lighting
circuit - or more specifically, in that case, the side/tail/gauge lights
were fused, but the headlights were not. To do such a thing has to be
specific design, not just an oversight, but I cannot imagine what the
idea was. Maybe they thought that a fuse failing, or one light shorting
out and the fuse blowing, followed by total darkness while driving at
70mph (or more), and the inevitable crash, was a greater risk than an
electrical meltdown resulting from no fuse.
Of course, they could have created a system which protected the circuits
AND prevented total blackout by having a separate fuse for each
headlamp, so if one blew you still had the other, but either
a) the fuses would have to have been downstream of the switch, leaving
the switch unprotected
b) the fuses would have to be upstream of the switch, requiring a more
complex switch with two separate supplies and outlets, one for each
headlamp, as well as a supply and outlet for the side/tail/gauge lights.
Richard & Sammy ('73 Black Tulip BGT)
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