Re: wiring issue
Lots of good suggestions given.
Since the car is not driven much, it could be the battery is never fully charged from Day One.
You could externally charge the battery at least every two to three weeks for an afternoon.
As said, ambient heat is electricity's worst enemy. More heat, more current needed to overcome the resistance in the circuit when power is requested.
Other ideas are the battery itself. Is it large enough capacity for the car?
A too small battery may not supply enough current when requested.
A too large of battery may not ever get fully charged and not supply enough current when requested.
The symptom for this is a click is heard, but engine does not crank/turn over.
Battery cables and their clamps, min size of cable is 1/0 gauge.
Posts and clamps need a cleaning, a battery post wire brush does the job very well.
A clamped connection corrodes internally also, needs cleaning once in a while.
As suggested earlier, the same cleaning goes for the ground connection.
An unpainted connection on the block is best, not on an accessory bracket because of the number of connections from the starter body to the battery negative post, the lesser number, the better.
Generally, with an up-to-par elecrical system, heat soak is not a problem.
Another suggestion mentioned is the solenoid power from ignition switch.
Ign switch and clutch pedal safety switch, either one or both, may have some resistance build up on the contacts limiting the amount of power to the starter solenoid preventing the solenoid from pulling 'in' to engage the starter motor.
This symptom shows up as 'no click' heard when start position is selected.
You mentioned using a remote switch to start. Good idea. Using the r/switch signifies new starter motor works. You might check solenoid circuit as suggested earlier.
A last resort is install in the dash, or under the dash, a marine grade push button start switch, #8 gauge wire, and wire up the switch just as you would the remote starter switch. You always know this will work. Grommet the hole in the firewall to prevent chaffing.
Let us know what you find, or don't find, and keep asking.
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