Did you check for corrosion on the terminals also on the plugs for the bulbs.... Do not know if it was foctory but when I bought my 66 I had the same type of problem except I had a 30 amp relay in the fuse block instead of a fuse and I found that it was going bad replaced it with a standerd fuse and fixed the problem. Never saw another relay for the brakes in any parts mag and it looked as if it could have been factory
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