I would replace the 80 amp strip fuse no matter what it looks like. I have never had an "intermittent" problem with a single GP but maybe it happens but next time it wont fire up check the continuity of each plug again. Then maybe its the relay.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"