You can fit the P.T or power cap in any port, the live and negative rails are joined across all 4 channels so it makes no difference.
However, if your receiver is shutting down by turning the servo 3 times under no-load, a power cap wont fix it, sounds like the servo is the issue.
This happened with a guy at our club, and once he changed the servo, the problems went away. We fitted a large powercap, and it made it slightly better, but didnt fix the issue until the servo was replaced.
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