I am not sure how or why my pool timer stopped working, but I would like to know how to troubleshoot this issue. I have a multimeter and tested the wires with the breaker off and wires 1&3 have a reading(coming from the breaker box) but the other wires do not change when testing. I have tried fliping on/off the breaker, fliping on/off the manual lever on the timer, still nothing. I believe the breaker is OK.

Can someone give me some troubleshooting tips?

I'm having exactly the same problem now with the timer. Did you ever solved your problem? Tks a lot,
Pablo

Test for power right at the outlet or connection to your electrical system. It could be the timer but could also be the power supply to the time.

If you have power to the timer and it doesn't rotate, its likely bad. Intermatic uses a New Style and an Old Style Timer Motors. 2 screws hold it in place and wires are on 2 terminals.
Bring with you or get numbers on the back.