It seems odd that you'd get two defective timers.
I bought one of these timers from Home Depot under the GE brand and the dial rotates correctly as time passes.
http://waterheatertimer.org/Woods-timers-and-manuals.html#59730Woods 59730/ GE 15107 timer is a mechanical timer, so circuit problems should not affect clock motor.
On electronic timers, if circuit is not clean (circuit has ground fault), then timers don't last long and do peculiar things.
My suggestion is to try timer on indoor plug, on a different circuit breaker, for 1 day and see if it keeps running.
This will tell you if outdoor plug might have a loose wire, and that electricity is getting cut off.
Add a comment and tell me what you discover, or add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.
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