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I think the missing "Main" fuse on earlier Volvos comes from the fact that these cars evolved over quite a few years and as things were added and they became more advanced, they just added more stuff to what was there. That's why there are fuses and relays scattered all over the car. The A/C condenser fan was added in 91 to an already aging design. Older cars in general were more fundamental; case in point, my 65 Chevelle has a heavy gauge unfused wire running across the radiator support from the battery to the horn relay. This line powers ALL of the car's accessories from that point. In a frontal collision, that wire would be broken and shorted against the metal frame of the car, without a doubt. The original battery had the positive terminal right next to the fender, so that would be a welding experiment too. When I got the car, I shorted my metal watch band between the battery terminal and the fender. The watch heated up and welded itself to the terminal......fun times. I've since changed the battery so the positive terminal is on the inside, and I've learned to remove my bling before going to work.
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