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DC 4.5-30V 0-10A Dual LED Digital Volt meter Ammeter Voltage AMP Power

How do I connect a DC 4.5-30V 0-10A Dual LED Digital Volt meter Ammeter Voltage AMP Power to my RV battery

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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.


Posted on Jun 02, 2014

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How can I check alternator on my 2001 ducati 750SS?


Connect a volt meter to the battery and start the bike....should be reading above 13volts if not alternator not functioning properly.

Aug 19, 2016 | 2001 Ducati 750 SS i.e. N-C

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How do I connect a 5 wire digital Volt/Ampmeter from my solar panel to my battery.


If you can identify which is the voltmeter and which is the ammeter, it should be simple. Say the solar panel has output wires of Red (positive output) and black (negative output). The ammeter goes in series with the load (cut the red wire and insert there). Voltmeter goes between Red (solar panel side usually) and Black. That accounts for four wires. The fifth wire may be an earth ground but I'd be guessing. If you can post a link from the manufacturer, I will comment further.

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The short answer is no.
Most amp meters are not designed to carry all of the power the car needs like meters used before 1950.
A better choice is a volt meter.

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Dc lo keeps blinking on the fridge and lights go low in rv, power converter middle light is blinking green


The battery is not being charged OR is no longer accepting a charge.

The inverter does not charge the battery. An inverter consists of components that first convert the battery's low (12) volt "direct current" (DC) power used to power automotive devices to a higher (120) volt "alternating current" (AC) power that is required by nearly all household appliances to operate properly.

The charging of the battery occurs when either the RV's engine is running and spins the alternator, etc. OR when connected to another charging device - whether it is permanent or portable.

With the RV engine running, there should be about 13.5 - 15 volts, DC on the battery posts or terminals. This voltage is coming fromt he RV alternator and since it is greater than the 12 volt battery, "charges" the battery. If you use a portable charger - that is part of a generator, or plugs into a power port at a camp site, etc. this will charge the battery.

When none of these things is happening, the battery voltage will slowly drop. Once it is at ~10 volts, it is "dead" and will need to be recharged.

The battery will no longer accept a charge if a "cell" inside it has "opened" or "shorted", or if the battery is at the end of its useful life. The battery state can be checked quickly by any mechanic.

I hope this helps & good luck!

Nov 19, 2013 | Electrical Supplies

1 Answer

It does not seem to be charging the batteries. 12 volt lights work good for about 2 days then go dim until I put a charger on the batteries and bring them back into working order. The battery connect...


The Parallax 7155 converter should not require battery support for any 12 volt load amperage that is less than the maximum amperage capacity of the converter. A standard RV incandescent 12 volt lamp draws about 1.5 amperes for each bulb. With the battery disconnected and other 12 volt loads off, turn on lamps (not fixtures) and calculate the number of bulbs which can be turned on. If you run out of lamps, turn on vent fans etc. The idea here is to try to get to 55 amperes of DC load if possible without going over 55 amperes. At a sustained DC load of about 25-30 amperes or higher, the fans should cycle on continuously after about 5 -10 minutes. Lamp brightness should be normal and the measured voltage from the converter should be above 13 volts if under 55 amps of DC load. If the voltage drops with only a few lamps on, a converter issue would be likely.

Diagnostic tests an RV technician should make would be to:
1. Disconnect the battery system.
2. With the converter system powered on, measure the DC amperage with a DC ammeter capable of reading at least 60 amperes DC from the blue lead at the DC fuse panel terminal VCC.
3. Measure the DC voltage at terminal VCC and DC ground.
4. Record both readings.
At any DC load amperage less than 55 amps, the voltage should be above 13.0-13.2 volts DC. This method should take out all guesswork and confirm a DC converter section issue or not.

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How to measure battery current using analog ammeter


This is the car and truck section, so you may want to ask this in a different section.
You can only measure current as it moves thru a circuit. You can measure voltage in a contained space with a volt meter.

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1 Answer

Battery not charging


The battery adapter or the adapter's power lead or the laptop's power socket could be faulty.
Check power adapter's DC plug that connects into the laptop power socket with a multi-meter, the voltage should be slightly higher than the voltage that is printed on the label on the bottom of the adapter. If the voltage is zero or way below the voltage that is printed on the label then the power adapter is faulty and needs to be replaced.
If the adapter is OK then connect it to the laptop and power it up, then look at the power/battery charging LED light and wriggle the power plug in the laptop's power socket. If the power/battery LED light flashes and in a certain position this LED light stays firm, then the power socket is either faulty or it has a dry solder joint where it is connected to the motherboard.
This can be repaired but it requires the laptop to be completely dismantled to get at this power socket and repair. If you cannot DIY then I suggest you get a quote first.

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1 Answer

How to use


Voltage testers and volt meters are two different things. A meter will provide a an indication of the exact voltage and type AC or DC. A tester on the other hand simply provides an indication of presence of power with little to no indication of how much or type.

AC power is what is provided by most power companies in the world. DC is a type of power provided by batteries and DC power supplies. If your tester or meter has provisions to check for AC and DC, you should check for BOTH. If AC power is present and you are have set your meter to test for DC power, your meter will indicate 0 volts. You can see this can be a dangerous condition. Most simple testers will not care if AC or DC power is being tested and the types that use neon lamps will usually glow differently for AC and DC power.

When setting up for testing voltage, you must test across the power source (or in "parallel") or load (such as a light bulb), as opposed to "in series" with the power source. Across would be from the + to - post of a battery, into the slots of an outlet, etc. "In series" is when the tester would be completing a circuit - such as testing across an open switch.

First, check the meter's operation by testing a known good power source by following the next steps. Set the meter for the type power to be tested. Choose AC if unsure. Next, set the meter for the highest voltage range supported. Make sure this range is higher than the expected voltage, otherwise damage to the meter may result. Connect the probes to the power source. Read the meter. If the meter moved only slightly, adjust the range of the meter to the next lower value. You can keep adjusting downward as needed to get the most precise reading possible - but do not set the range to a value less than the voltage present. A 0-300 volt scale is the lowest to measure a 240 volt outlet - switching to a 0 - 150 volt scale will damage the meter. The 0 - 150 volt scale would be fine for measuring 120 volt outlets.

If the meter did not move, change the type from AC to DC. and repeat. If it still does not work, the meter is not working correctly (if testing a know good source) or there is no power present (if the meter worked on a known good power source).

Good luck!

May 12, 2012 | Measuring Tools & Sensors

1 Answer

Fan on my big buddy heater just stopped working changed batteries still not working?tried the switch nothing .i only have radiant heat.


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.

Sep 08, 2010 | Mr. Heater Big Buddy Heater

1 Answer

When I plug in my jet 3 ultra the ammeter reads 0. If I turn on the vsi controller the top led display( 3 red, 4 yellow, 3 green) are all lit. I see where that means high battery voltage. The lower led...


Its showing you the voltage out put for the charger if all power lights are lit and the chager is pluged in if batteries show only 2vlts then they are no good and the will not charge up thats why amp meter is on 0

Mar 03, 2010 | Jet 3 Ultra Power Chair

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