You should not worry about the wire size of the fusable link, but how many amps it is rated at. Personally I would stay with a fuse to replace it or one of those circuit breakers that resets itself. I don't think a 20 amp fuse is big enought to replace the fusable link. You probably need more like a 50 amp. That wire runs every accessory inside the truck,and it wouldn't take much to exceed 20 amps.
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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72 GMC Sierra SWB almost finished---- 84 Softail
Olive Branch MS
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