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/// Generally failure on heat up is bad electric contact. You did not say if it will turn over or just not crank. If it will turn over jump the positive system wire from the battery post to the distribution rail. If it will not turn over use you jumper cables to bypass the negative battery cable. Both clamps one end on the battery post clamp and both on the other end to the engine.
You can test the positive system wire by turning on the radio at the point of failure. If the failure involves high resistance rather than open circuit this test may not be certain.
These two may not be your problem but you should eliminate them before spending money on a long list of replacement "might be" parts.
Both tests must be done immediately on failure.
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