
Originally Posted by
oka374
I had a 740 turbo Volvo which melted the main fusebox a few times over the years because of the fusebox contacts being brass and the fuse spades being alloy. The brass bits lose tension and the alloy soades oxidise which means a High Resistance joint and creates heat which buggers theings completely.
Volvo 740 fuse boxes were ****. The high current fuses were high beam, A/C compressor and HVAC blower. They all melted over time.
I used Penetrox on the fuse blades, but the high current circuits all got bypassed by externally fused relays. It wasn't a great design. Up until the 740 they used Copper/Ceramic fuses. They were pretty much indestructible. The fuse box had fat brass contacts and the fuses were pretty much temperature indifferent.
The 740 was the first move to blade fuses and the fuse carried more current than the fusebox. The Fusebox would start to melt which then increased resistance and melted the plastic around the fuses, resulting in a molten mess.
I had a bottle of Penetrox from doing roof mounted Antenna connections. Basically a thick zinc/oil paste. It helped, but for the high current circuits the only fix was bypassing.
MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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