Lilfur said:...and even replaced with a new starter , still same thing.
I missed that on the first read. That statement in itself would lead me to think there is a wiring issue. Could be the main battery cable from the battery to the starter solenoid, or the "start" circuit from the iggy switch. The purple wire on the solenoid MUST have 12v
while cranking to fully engage the solenoid, and make the starter spin. Same with the battery cable on the solenoid.....if voltage gets below 10v, the starter will not spin at full speed.
One of the reasons using a Ford solenoid works so well is that it eliminates a problem with the iggy switch, and low voltage to the "start" terminal on the solenoid, plus, it removes the solenoid for the heat that can cause that.
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