I have the Saco XX fence charger. Only the center light illuminates and there is no voltage on the fence or at the terminals. Both fuses look fine. Is it repairable?

Stop Lamps
The brake pedal position sensor is used to sense the action of the driver application of the brake pedal. The brake pedal position sensor provides an analog voltage signal that will increase as the brake pedal is applied. The body control module (BCM) provides a low reference signal and a 5-volt reference voltage to the brake pedal position sensor. When the variable signal reaches a voltage threshold indicating the brakes have been applied, the BCM will apply battery positive voltage to the stop lamps, transmission control module (TCM), engine control module (ECM), and stop lamp relay coil side. When the stop lamp relay receives battery voltage from the BCM, the relay coil is energized and the stop lamp relay switch contacts close applying battery voltage through the STOP LP fuse to illuminate the center high mounted stop lamp (CHMSL).


Ignition OFF, disconnect the stop lamp relay.
Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal 86 and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Ignition ON, verify that a test lamp does not illuminate between the control circuit terminal 87 and ground.
? If the test lamp illuminates, test the control circuit for a short to voltage.
Verify that a test lamp illuminates between the B+ circuit terminal 30 and ground.
? If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 87 for a short to ground. If the circuit tests normal, test or replace the stop lamp relay.
Ignition OFF, disconnect the harness connector at the CHMSL.
Ignition OFF, exterior lamps OFF, test for less than 5 ohms between the ground circuit terminal B and ground.
? If greater than the specified range, test the ground circuit for an open/high resistance.
Connect the harness connector at the CHMSL.
Connect a 10A fused jumper wire between the B+ circuit terminal 30 and the control circuit terminal 87. Verify the CHMSL is illuminated.
? If the CHMSL does not illuminate, test the control circuit for an open/high resistance. If the circuit tests normal, replace the CHMSL.
Connect a test lamp between the control circuit terminal 85 and ground.
Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded states.
? If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
? If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
If all circuits test normal, test or replace the CHMSL.

DTC B3903 Stop Lamp Relay Circuit
The body control module (BCM) supplies voltage to the center high mount stop lamp (CHMSL) and the powertrain control module (PCM) when the stop lamps are active.

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

Using a 12v test light, with the ignition off, key out, pull one fuse at a time. With the fuse out, connect the test light to each terminal in the fuse block of the removed fuse. If there is a short circuit or any draw whatsoever, the light in the test light will illuminate. Doors and trunk need to be closed. If there is a under hood light the bulb should be removed. This will test for individual circuits. You can also do this same test to check for an overall draw by removing the negative battery connector and connecting the test light to the battery post and the other to the removed terminal. If the test light illuminates it indicates a draw. However removing this terminal may have some implications such as losing radio settings, etc. Alarm systems and radio memory settings will obviously always draw from the battery with the switch off.

COULD BE FUSE MAYBE RELAY OR HEADLIGHT SWITCH.

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

The fuse is under the hood in the main fuse center

No, not just for those. There should be a fuse for the tail lights in the instrument panel fuse box. The illumination lights for the dash and the park lights are from the headlight switch, so maybe you have a bad switch. Find the fuse for the tails, pull it out, and check the terminals for power with the park light switch on. One of the two terminals where fuse plugs in should have power-it should light up a test light or show voltage on a meter. If no power on either terminal, probably the headlight switch is bad.

I would check the dash lights fuse first. If the fuse is good and the circuit has voltage, you may have toasted the dimmer control.

Rear Defogger Inoperative, But Heated Mirrors Operate Correctly
1. Connect scan tool. Turn ignition switch to RUN position. Turn rear defogger on. Using scan tool, display BCM
outputs. If rear defogger is being requested on, go to next step. If rear defogger is not being requested on, go to
step 10).
2. Ensure ignition switch is in RUN position. Remove rear defogger relay from rear junction block, located on center
right rear of passenger compartment, under rear seat. Connect test light between ground and defogger relay
harness connector terminal F3 (Brown wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 11).
3. Connect test light between ground and defogger relay harness connector terminal A2 (Red wire). If test light
illuminates, go to next step. If test light does not illuminate, go to step 12).
4. Connect test light between defogger relay harness connector terminals A2 (Red wire) and B3 (Purple wire). If test
light illuminates, go to step 13). If light does not illuminate, go to next step.
5. Disconnect rear defogger positive and negative feed bus connectors. Connect a jumper wire between defogger
relay harness connector terminals F3 (Brown wire) and A4 (White wire). Connect test light between ground and
positive feed bus connector terminal "A" (Black wire). If test light illuminates, go to next step. If test light does not
illuminate, go to step 8).
6. Connect test light between positive feed bus connector terminal "A" (Black wire) and negative feed bus connector
terminal "B" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 9).
7. Repair open in Black wire between rear defogger and ground. Recheck system operation.
8. Repair open in Purple wire between rear junction block and heated backlight antenna module. Recheck system
operation.
9. Check for proper terminal contact at rear defogger connectors. Repair as necessary. Recheck system operation.
10. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.
11. Repair open in Brown wire between rear junction block and instrument panel junction block. Recheck system
operation.
12. Repair open in Red wire between rear junction block and underhood junction block (located in right front corner of
engine compartment, between battery and strut tower). Recheck system operation.
13. Connect test light between defogger relay harness connector terminals F3 (Brown wire) and A4 (White wire). If
test light illuminates, go to next step. If test light does not illuminate, go to step 16).
14. Reinstall defogger relay. Disconnect BCM 32-pin Pink connector C2. BCM is located behind right side of instrument
panel, near rear of glove box. Using DVOM, check voltage between ground and BCM harness connector C2
terminal A3 (White wire). If any voltage is present, go to next step. If no voltage is present, go to step 17).
15. Repair open or short to ground in White wire between rear junction block and BCM. Recheck system operation.
16. Check for poor connection at defogger relay terminals. If connections are okay, replace defogger relay. Recheck
system operation.
17. Check for proper terminal contact at BCM. If terminal contact is okay, replace BCM. Recheck system operation.

Here is repair information from Mitchells:
1) Disconnect power mirror switch connector. Connect test light between power mirror switch harness connector terminal "A" (orange wire) and ground. If test light illuminates, go to the next step. If test light does not illuminate, repair open in orange wire between power mirror switch and righ rear power distribution center fuse block No. 1 (located under left side of rear seat).
2) Connect test light between power mirror switch harness connector terminals "A" (orange wire) and "J" (Black wire). If test light illuminates, check for poor connections at the power mirror switch. If connections are okay, replace power mirror switch. If test light does not illuminate, repair open in Black wire between power mirror switch and ground.