My 86 Chevy chassis motorhome had the same problem. After changing the starter solenoid and adding the heat shield (recommended for big blocks especially), problem was still there.
Found out it has a 'hot start soleniod'. Looks like a ford fenderwell mounted starter soleniod. After changing it, my motorhome starts everytime no matter what.
Hope this helps, VIC
'wildfirev9'
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Monday, June 28th, 2021 AT 9:59 AM