MJR wrote:
symptoms
1. garage lights won't turn on
2. garage door opener won't go up/down
3. when light switch is off, garage opener sensors light up
4. when light switch is on (lights don't go on), sensors go off
5. Voltage tester shows 104 volts in all outlets in garage


what should I do (besides calling an electrician)?

the problem began soon after the first rains in 6 weeks

the power to the garage is underground conduit from the house, under
the yard to the garage.

For the moment, let's ignore that 104 Volts as I believe it is a red
herring.

Go check the circuit breakers, Is one tripped? I suspect not. Now
check out all your GFIs. One or more of them should be protecting your
garage. They may be in the garage, kitchen bath or breaker box. It the
test and reset button on each one.

If that gets you power, the 104V you found was only a very low amp
induced current and you never would have been able to measure it without
that digital meter you used.


--
Joseph Meehan

Dia duit