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Truck starts fine cold,but cranks slow and wont start when warm.

(1990 Ford Ranger)
in Estacada, OR on June 01, 2017
replaced cable ends,checked wires.battery is old but is holding 12.80 volts.
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on June 01, 2017
Very commonly with the older Ford pickups and vans, the starter overheats while the engine is running, and causes excess current draw when attempting to start.
Check that the cable from the battery to starter is in good condition, and that it is not grounding to the engine block. Also, make sure there is no play in the starter motor, as this can allow the positive cable to ground as well.
You can also see how much current the starter is taking by testing the battery voltage while cranking on a warm engine, My guess is that the battery drops below 10 volta immediately, but cold the battery would be in the 10.5-12v range.
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