How do I reset the alarm on the Namtek wizard 4 electric fence energizer

https://nemtek.co.za/wp-content/uploads/2021/10/user-manual-wizord-2.pdf

Depends on other conditions.

check out put with meter or tester - check connections and ground --check line for break or debris

Flashing service light usually means the battery might be going bad. Also, check the fence for any branches or grass making contact.

The high voltage output is a transient wave form ?
The fence would have a certain resistance
the voltmeter may not have the same resistance.
if the output energiser resistance is not matched by the volt meter's resistance then the maximum power transfer will not be achieved. If the fence resistance is matched to the energiser output resistance then maximum power transfer will occur.
https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem
if a transisient wave form is generated the voltmeter won't read the AC voltage as it is not a sine wave .
The high voltage on the fence conductors may be present in the form of intermittent pulses of short duration, or as a continuous AC or DC voltage.
https://patents.google.com/patent/US7893521

electric fencers work on a pulse system so that what ever touches the fence gets a series of electric jolts
normally it will tick or click at a 2 second interval

Unless that thing runs off batteries, don't tinker with it.

If it runs on mains power, ring round some local qualified electricians until you find one who can explain the possibilities to your satisfaction, then call him out to fix it.

Not GOOD.

Shut off the power... find the body(s), branch, bicycle,
(whatever... is shorted to ground)... REMOVE IT...

Restore power.

If you find nothing... disconnect the fence and if the "power"
is still "noisy" it probably is tie to assess a REPLACEMENT.

1. A solar powered electric fence energizer usually contains a battery for energy storage. The solar panel collects the energy from the sun and charges the battery. Lead acid batteries, which are used in solar fence chargers, typically last around 3 years, or around 1,000 days of charging.

   About Fence Chargers - Zareba Systems

   www.zarebasystems.com/learning-center/all-about/fence-chargers
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About Fence Chargers - Zareba Systems

www.zarebasystems.com/learning-center/all-about/fence-chargers
A solar powered electric fence energizer usually contains a battery for energy storage. The solar panel collects the energy from the sun and charges the battery. Lead acid batteries, which are used in solar fence chargers, typically last around 3 years, or around 1,000 days of charging.‎What can I do to prevent ... - ‎What factors should I consider ...

[PDF]Fence Controller Installation - Zareba Systems

Unplug your Bose system for 5 minutes to reset the processor ic, now plug back in, if no change! contact Bose, this is a product that is only repaired on site at the factory and they have the parts.