CP 302 wlder

If it is arcing with barn main off there is something else connected to feeders to barn. No load no arc. If your sure nothing connected then Meg feeders (wire insulation test) especially if feeders are underground. Possibly bad lnsulation, eventually it will burn in half.

1. Measure the power supply output voltage with a Volt-Ohm-Meter. It should be 12 VDC. If no DC voltage replace power supply (I suggest NiuGuy 12 V 8.5 Amp model from Amazon).
2. If voltage is present then is the fan running? If voltage is present and fan not running then replace fan with AD0912HB-A70GL from Amazon.
3. If fan is running but no water is being released then replace Pelitier Module with TEC1-12705 available on Amazon.
4. The only other parts are simple switches and a fuse which all can be checked with an Ohm-Meter.

These units are very simple and easily repairable.

Best regards from an Electrical Engineer

amp meters are wired in series in a power circuit
that is to say cut the wire and attach each end of the wire to the terminals of the amp meter
you have to know the amps in the circuit to get an amp meter large enough to read the current or it will burn out
( a 60 amp meter for a 120 amp power wire is not right)
in that case you can get an amp meter that runs a resistance in the back of the unit and as volts and amps are directly related by reading the voltage drop across the resistance the current (amps) can be read
That allows a small amp meter with a high face reading to be attached to a large current wire 10000 amps etc
you can also get amp meters that have a crab claw clip that goes around the power wire and by reading the flux field voltage converts that to an amp reading without touching the wire ( used by electricians to check current draw in electrical motors etc )

Its probably drawing high amperage causing the motor to overheat. It may have the wrong size capacitor or weak capacitor. Or it is the wrong HP (horse power) or RPM. If you had a clamp on amp meter you can check the amperage by clamping around the L1 (normally the black) wire. Then check the amps that the motor is rated for (labeled on motor and box it came in). The amperage should be lower than it is rated for. Example... Amp meter reads 1.2a clamped around the L1 wire (left side of contactor) and motor rated at 1.5
If L1 is greater than 1.5a it will over heat. The new motor should be rated the same as the old HP, RPM & VOLTAGE.

If you want to read just the DC VOLTAGE of your RV battery , with the multimeter in the proper VOLTS range , you would simply connect the red lead to the positive feed and the black lead to the negative feed and read the digital display of the meter.

Whenever you want to read DC AMPERAGE with a multimeter , first set the meter for it's highest amps. Then you must connect the meter leads in SERIES somewhere within the circuit. This means that you will have to first create an OPEN in the circuit and then connect one lead from the meter to one side of the open and the other meter lead to the other wire . For example : let's say we would cut one wire going to a light bulb and then we would connect the AMP meter between the 2 ends of the cut wire , we could now read the AMPERAGE or SERIES FLOW of the current that the bulb draws when it is powered on.
Remember , NEVER connect the AMP METER directly across a powered circuit. It's like putting a direct short across the circuit.
Be sure to select the proper AMPS range setting on the meter before connecting the meter to a circuit. I recommend starting with the HIGH amps setting first to get an idea of just how much the circuit being tested actually draws when it it powered on. If you would happen to first start with a lower amps range , you might blow the protective fuse located usually inside the multimeter. Do no exceed the range of amperage that the meter is rated for.

if the battery light is on while running the charging system is not working.you can check
with a volt meter,setting meter to dc volts & connect meter leads to battery.reading should
be 13.2 - 14.5 volts if lower than this your only reading battery voltage.check single red wire to the alternator it should read battery volts 12v.if battery voltage is present than alternator is faulty,if no voltage reading you'll need to trace & repair the wiring
note; battery should be fully charge before testing

good luck

I would first check the wiring connections to fan and get a multi meter , set on 12 volts dc and see if fan motor has 12 vdc input voltage.
Too cheap to buy a voltage tester at wal mart ot harbor frieght, you can use a 12 volt bulb and socket, if you already have one. Remove fan wires & hook up 12 volt light bulb & if it lights, you got the juice. Carefull,dont let live wires touch because you short out $26.00 big buddy fan transformer. work with fan transformer unplugged from wall and dont plug in until you sure no wires touch.
use electrical or duct tape. electrical tape better.

otherwise,just buy the multi meter, they only $8.00 to $10.00
read & understand instructions, before you try to use it. otherwise,you could burn out your new meter.

well worth owning &
learning to use multi meter. I use it thousands of times.

if fan motor has juice but wont run, check fan shaft to see if it turns freely or scrapes or is stuck. oil fan motor bearings ,change the brushes.
make sure that the fan blades are not touching the fan housing and can turn freely.
if it still dont work, buy new fan motor.
if no juice at fan motor, check mr heater switch with the power off,unplug transformer from the wall or remove batteries.,
and use the ohm meter setting of the multi- meter to test for continuity of the switch when the switch is in the on position.
power must be off when using the ohm setting of a multimeter.
if power is on & using the ohm setting of the multi meter, you will blow out the multimeter. The ohm setting uses a 1.5 volt dc battery inside the multimeter to test for a compleated circuit.
so, 12volts dc would blow it out on ohms setting.
TESTING FOR OUTPUT OF FAN TRANSFORMER OR BATERY PACK.
If the switch is good,reinstall it on mr.heater and test the output of the transformer or battery compartment using the 20 volt dc scale of the multi meter. the voltage scale you select ,must be higher than the voltage you expect to find ,in order to avoid damage to the multi meter.
observe polarity,positive to red and negative to black.

the dc voltmeter setting is totally polarity sensitive and a reversed hook up could blow out the meter.
multi meter means it can read ac volts, dc volts,ohms and dc amps. Read and understand the included instructions before using a multi meter
a good single battery in new condition reads 1.62volts dc
1.5 vdc is almost dead, a good used battery reads 1.58 to 1.6 vdc
below 1.58 vdc is weak battery and 1.48 vdc is usually totally dead, but may be enough for momentary usage under 1 minute.

On the right side of your glove box, open the passenger door to access compartment #26 30 amp.

As for the power windows, try this.
1.        Measure voltage at 30 amp circuit breaker #26 at fuse block. Meter should read battery voltage. If not, replace or repair open to 60 amp fuse #13 in Power Distribution Center (PDC) as required.
2.        Turn ignition switch to off and measure resistance from ground lug on left side kick panel to ground. Meter read zero ohms. If not, repair open to ground.
3.        Remove master power window switch on left front door. Measure resistance at black wire (terminal one of green connector). Meter should read zero ohms. If not, repair open to ground.
4.        Turn ignition switch to on and measure voltage at terminal 5 of black connector. Meter should read battery voltage. If not, repair open to circuit breaker #26 in fuse block.
5.        Close master window switch. Measure voltage at terminal 1 of black connector. Meter should read battery voltage. If not, replace switch.
6.        Operate window switch. All windows should operate.


Thanks. you can rate this solution and show your appreciation.

you can test the motor with a multe tester with ohms capable, locate the heater motor and the wires feeding it there will be 2 find the plug and unplug it, using the tester probe the 2 wires with the red and black from the meter to the motor side, on ohms scale the meter should deflect close to full scale, with a digital it should read around 30 or have at least have a low number but no lower than 20 or so, if you get a reading your motor is probably OK, you can also use the meter in voltage mode and with the heater turned on you should read a voltage higher than 10 on the vehicular side of the plug, if there is no voltage there check to see if you have voltage at the heater fuse, if so than replace your fan control switch,,,good to go