4 year old Sta-Rite JWPA pump with A.O. Smith motor, wired directly to timer output on my chlorine generator control panel. 2 nights ago finally got rain. Circuit breaker (GFIC) for pump tripped when timer turned it on in morning. Isolated short circuit to motor. Took motor apart, looked for obvious shorts from loose or bare wires. Nothing. Poked around, put it back together plugged it in (120 v) and it ran. Reinstalled everything and pump ran all day and turned on again in morning. Noticed shaft seal leak (salt water pool, also) so I ordered shaft-seal kit. Last night, rain. GFIC tripped again in the morning. This time can't resolve the short. What shorts out on these motors? Windings? Looks like some kind of centrifugal set-up on the shaft (white thing bridged by a spring. Also some breaker points running to a capacitor? I'm ready to order a new motor, just curious about these things, since the motor isn't very old.
Thanks, in advance for any insights.