Will not read ac or dc amperage

You need some minimum amperage, bigger is better in this case if you don't know what it should be.

Changes between AC and DC voltage at the electrodes.



Q: What Type Of Stick Welder Works Best For All-Around Use?

A: A welder with an AC/DC output, whether its an electric arc machine like Miller\'s Thunderbolt or a gas engine drive like Miller\'s Bobcat.

DC welding offers advantages over AC for most Stick applications, including: easier starts; fewer arc outages and sticking; less spatter/better looking welds; easier vertical up and overhead welding; easier to learn "how to weld" and a smoother arc. DC reverse polarity (electrode positive) provides about 10 percent more penetration at a given amperage than AC, while DC straight polarity (electrode negative) welds thinner metals better.

Q: Does An AC Output Have Any Advantages?

A: Yes, if you need to weld on material that\'s become magnetized from friction, such as when hay, feed or water constantly rub against a steel part. A DC output won\'t work because of "arc blow," where the magnetic field blows the molten filler metal out of the weld puddle. Because an AC output alternates between polarities, it enables you to weld magnetized parts.

if the charge light is going out after starting then it is charging. Next step is to use a multimeter that has the ability to read volts DC and volts AC. If it shows Volts dc 13.5 to 14.5 volts at around 2.000rpms then it is good . If it shows volts ac then the rectifier in the alternator is not working and needs replacing . Next place an amp meter in the line to the battery and read the amperage .It will read in a ratio to the volts DC so if the volts Dc is up around 14.5 then the current flow will be low but if it reads 12 volts then the current will be high. If the volts dc is over 14.5 volts say 16 volts then the current will be high as the regulator is not controlling the current out put. If this sound daunting then go to an accredited auto electrical shop and have it checked out

Yes you can, but there are 2 important considerations. One is if the adapter puts out AC or DC signal. Adapters may have the same plug on them and putting the wrong one on could permanently damage your equipment. The other thing to look for is amperage, or an A rating. You may see something like 9V DC 2A on an adapter. If you are replacing a damaged adapter, look on it before you try a new one. Most all adapters have printed on them, by the plug, what their voltage, amperage, and AC or DC output are. Try to get the closest possible match. If you are off a bit on the amperage, the equipment may still work, but may act sluggish, or not like it is powered up all of the way. You could still damage the equipment this way too, so do be careful.

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.

The computer's switch mode power supply produces DC (direct current) electricity.

HP AC adapter, HP part number 416421-021?

http://www.amazon.com/Compatible-HP-416421-021-Adapter-Charger/dp/B0050DN8X8

Plug going from AC adapter to DC Power Jack on laptop;

Center of the plug is the Positive ( + ) connection.
This is where the red Positive probe lead of the multimeter goes.

The outside cylindrical metal shell is the Negative ( - ) connection.
This is where the black Negative probe lead of the multimeter goes.

The Function knob should be set to DC Voltage.
(Unless you have a multimeter, that automatically detects whether it is AC, or DC voltage you are testing)

If more than one scale set it to the 0 - 50 Volt scale.
You should read VERY close to 19 Volts.

[Label on AC adapter.
Output: 19V / 4.74A

19 Volts at 4.74 Amp's. (Amperes)
Don't worry about the Amperage, just the Voltage ]

For additional questions please post in a Comment.
Regards,
joecoolvette

Check this link below:
http://www.lcdpayless.com/productpage.php?productId=5441

Specification of Protron pltv-32 lcd ac adapter:
Output Voltage: 24V and 12V Volts DC
Amperage: 6 A and 3 A Amps

Buyer beware. Contact the manufacturer and replace the needed parts.

Make sure the voltage and amperage is the same and the tip fits.
I use I-GO universal from Radio shack