BEFORE YOU CALL GUIDE
You will need the following:
A fundamental understanding of electricity (otherwise get assistance)
Your coach’s AC input wiring diagram, mfgr product troubleshooting guides and product specifications
Voltmeter that will measure up to 250V AC
Scenario:
You lose shore power for no obvious reason. If you have a TRC Surge Guard unit, the following procedures will help you
determine whether you have a problem with your Surge Guard, in your coach electrical system, or an external power
problem. Also see the following pages for additional detailed checks and for recording applicable voltages for your Surge
Guard.
Troubleshooting Steps:
CAUTION – For the experienced coach owner, otherwise get assistance.
1. Look at the transfer switch display or Surge Guard lights to see if there is power to the unit.
2. Follow the manufacturer’s troubleshooting guide to help determine if the surge protector failed.
3. We recommend you do not bypass the surge protection if at all possible. In the event the Surge Guard is doing its job,
it is preventing faulty power from damaging your coach equipment. That is, it may have prevented severe damage to
your coach electrical and electronic equipment and appliances.
If it is not obvious what is wrong after following the manufacturer’s troubleshooting guide, continue as follows: Using a
suitable AC voltmeter, measure the power at the pedestal (power source) to determine if the input power is between 102V
and 132V AC (from L1 to Neutral and L2 to Neutral). Remember that Ground is normally bonded to Neutral at the RV park
power source or pedestal. Ground to Neutral measurement should read 0V.
Pedestal measurements (Figure 1):
1. Measure B to W (L1 to Neutral), should be between 102V and 132V AC
2. Measure R to W (L2 to Neutral), should be between 102V and 132V AC
3. Measure G to W (Ground to Neutral), should be 0V
Adapter Measurements:
If you are using a 30A to 50A adapter, the voltages at the 50A connector will be the same as above. Note that B to R
voltages will be 0V if using a 15A, 20A or 30A adapter.
For hard-wired units and transfer switches, repeat the above measurements at the input(s) to the units.
Provided all measurements are correct we have to assume that the Surge Guard has failed and needs to be replaced.
Why is Surge Guard protection needed?
RVs today have highly sophisticated electronic circuitry with an array of expensive appliances. The largest threats to a
RV’s electrical system and appliances are surges and the power pedestal, either miswired or faulty electrical power.
Surges and faulty power can result in significant damage to these appliances. TRC engineers designed the Surge Guard
models specifically for RV power applications and are field-proven in all kinds of rough applications. TRC manufactures a
complete line of Surge Guard products that offer bumper-to-bumper protection for all RVs.
Figure 1: Pedestal Power Configuration
Typical: W-B, W-R = 120V, W-G = 0V
G = Ground, W = Neutral, B = L1, R = L2
30 Ampere 50 Ampere
120 Volt 240 Volts
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