Dc amps showing -10 after overnight charge - Xantrex Technology Xantrex 458 10 12 Freedom 1,000 Watt Inverter/Charger

Those have a 1 year warranty so depending on its age it is probably due for replacement.
They should be charge once a month or after each use.

Hi gelly, unless the battery you have purchased just happens to be faulty (can you test with another) then i would suggest that the mainboard is faulty (charging circuit is not working as it should) and unless you are good with a diagram & soldering iron i would recommend taking to a good local tech. Hope this helps.

great questions...!!!
no it cant, mine can.
most dmm do 20 amps
most cars do 100 to 500 amps. cranked.
the alt can do 50, some more.
yes, its all DC, and the best tool is a DC amp clamp meter for $50
the alt is AC inside, and DC outside, thus the name.
why jnot say context what are you doing.
i need to know your plans.
dead battery ever 5 hours.
car wont start
battery explodes.
wires melt.
what?

testing the ALT on car , takes some skills
alts. can in fact shut down even when 100% OK (it's loansome)

most folks never read the spec on the VR.
its can be very complex this.

cases in point.
open ground or big wire.
battery going open inside. (cracks in battery or a cell dries up)
over volage (over 16v)
battery shorts. or cables shorts.
cable opens or ground opens/
some newer cars the ECU is the VR. ! !!!!
older cars the charge lamp out , nets you no, start up exciton field current (born dead ALT)

to do this we must know what alt we have.
the FSM covers that as does ALLDATA.com

so here are the 1st test.
12.6v at battery means charged (resetted and not freezing)
13.3- 15v running means the ALT is working
i stall engine
and leave head lights on for 2 mins. or so.. battery was discharged.
so i start up with my amp clamp (DC) clamped on to the
ALT big signal wire, it shows me 40amps.
good.
if not bad.
as i watch it ,it can drift to zero (or to 5amps ignition power)
note polarity , - is drain + is charging.
depends on clamp orientation, that is why i use discharge test first.
+40amps?

need more ask.

amps or volts
11 to 12 amps indicates nothing but if it is volts then it indicates that the alternator is not charging the battery
Battery voltage is 12 -13.5 volts and when charging is 14.5-14.8 volts dc
the rest of your statement indicates that the alternator or voltage regulator is faulty and you should have the charging system checked by an accredited auto electrician

I have done this before, put about a 10 amp charger on the battery. Pull the courtesy light fuse first. Look at the battery charger, it is probably charging several amps, pull one fuse at a time. When the charging amps drops down you found the fuse the controls the problem. I had a car several years ago that someone pulled the seat belt all the way out, somehow it was pulling a load and draining the battery overnight.

The battery is 12 volts and to charge use a 2-10 amp charger.

You need to use a 12volt dc charger no more than 15amps.

1. Take the battery out of the laptop & try to turn on the laptop using power

adapter only. If the computer turns on, then the battery is defective & needs to be

replaced.
2. Make sure the power adapter is not defective. Test the output voltage of the

power adapter using a voltmeter. Compare the voltmeter reading to the nominal value

written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re

-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try

swapping processors & test to see if the laptop will work.
5. The power button could be bad.
6. The motherboard could be defective & needs to be replaced

1. Take the battery out of the laptop & try to turn on the laptop using power adapter only. If the computer turns on, then the battery is defective & needs to be replaced.
2. Make sure the power adapter is not defective. Test the output voltage of the power adapter using a voltmeter. Compare the voltmeter reading to the nominal value written on the adapter or the laptop.
3. Make sure the DC jack is not loose or broken. A loose DC jack will need to be re-soldered. A broken one will need to be replaced.
4. If you have another processor which is compatible with your laptop's model, try swapping processors & test to see if the laptop will work.
5. The power button could be bad
6. The motherboard could be defective & needs to be replaced.

the battery can pull 30 amps,and after a couple minutes 5 to 10 amps.the battery will be fully charged in an hour. At a 2 amp charge rate,it will take overnight to charge.