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This could be :
1. an intermittent fault
2. a high resistance in the starting circuits.
Let's assume it is high resistance.
Use an Ohmeter ,starting at the battery terminal and work through the system.
It is a tedious and pains-taking process. Flailing/guessing not recommended.
Check the battery cable for severe corrosion under the insulation- slit the insulation along the length of the cable several inches and check.
Ground connections corroded?
Horrible work when it is cold/wet.But so is walking !
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