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Hi,
I have a hunch that you have a bad engine ground. The starter solenoid will not pull in with less than about 9 volts ACROSS IT.
If the starter motor to ground circuit has resistance in it you can easliy loose 5 to 6 volts. The starter mootr and the ground resistance become a voltage divider and the starter motor has to share your 13 or 14 volts from a new battery.
Carry a set of jumper cables and next time the starter fails to work, hook one of the ground cables from the negatve battery terminal to a good solid ground on the ENGINE. Try the starter like that. If it goes, your normal ground is bad.
This problem often shows or goes away depending on where the car is parked because the engine can tilt and self fix the bad ground. I have seen the problem go away if you pull on the engine. If you have an ohm meter, measure resistance fro engine to ground terminal. It must be zero. shake the engine and resistance must not change. Always measure from the terminal itself not the car body or even the cable.
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MrC
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