Instructions only explainhow to test battery; how do I test charging system with this unit?
1843413
It dose explain it but not well. all you do is connect positive and negative, start your car and check the voltage. if you have between 13.5 and 14.8 you should be good. although this can be done with a volt meter, for an accurate test of your alternator, you need an amp meter.
1887921
When you first plug it in, the charging symbol should show up on the screen. If it doesn't, use the AC adaptor. If that doesn't work, you may have a bad battery, or a problem with the unit itself.
735680
You have to ensure the internal battery is charged or ensure that you have a good connection to the vehicle power source. If you have the USB connector you can charge it that way, although I never have been able to operate solely on the battery for any length of time.
1712768
its not a load tester. it uses different system i think. i have a battery. it shows it needs recharge. but cca is ok... i dont understand is it working or can i trust its test...
233642
First use NEW batteries. I thought my so-called NEW batteries were fresh and up to charge. They were not! Get a battery tester. Once I had batteries that had a full charge It started without having to do it manually. I do not manually do it any different than the other six answers in any major aspect. I had to start it manually until I realized that I had new batteries that did not have a full charge. Now it works fine without having to resort to manual operation.
1113507
really have no idea unless bad contact with charger, OR you got a bad battery with yours. Call the company.
2141719
When you say you plugged it in, does this mean you wired it to the battery? Or did you plug the charging connector to the connector on your battery, or did you wire it and plug something into it? If 1. you wired it to the battery, you wired the positive connection to ground. As soon as you turned it on you completed the circuit and burned the smallest wire. 2. You plugged the charging connector to opposite connections and you got positive wired to ground. 3. The item you plugged into the unit has a direct short from positive to ground and you burned that item out. Follow the instructions very carefully. Connect the red lead to the positive + side of the battery. Connect the black lead to the negative - side of the battery. Replace the fuse that burned out, and plug the connector into the wiring harness. If you wired it correctly, it should have power all the time, whether or not the key is turned on. You turn the unit on and off via the switch installed in the unit.
1129488
i was having this issue as well...but i read that there is a RED light that turns on when the battery is charging...so i played with the USB that is plugged into the unit, and found that the red light turns on when its plugged about HALFWAY in. i checked, and it IS in fact charging. try adjusting the B side of the USB (mini part thats in the actual unit) before you return it.
578684
Simply hook up the negative and positive and plug something in to test. If you don't get see the device being charged, reverse the wires. Due to the low voltage, you won't damage anything.
1984642
I had the same question after i received the charger, there were no instructions with it. It came wraped in a peice of plastic. I ended up purchasing a new charger with a digital guage so i could tell if the battery was fully charged.
167675
The battery is in the unit. You just plug the separate cord into the unit and plug into a receptacle and it charges!
1397249
you probably have seen it at the Shorai site, but they have an application finder. What I mean is you input your vehicle and it finds the battery. That's how I did it and it worked great.
2013698
Make sure its fully charged. I only figures this out after testing it out and seeing very short videos of the test. I know there has been some complaints of malfunctioning, but mine works fine.
1659996
The power light on the right side of the unit "should" indicate the battery status of the unit, not the battery being tested. So, here's a thought, try putting "fresh" batteries in the unit, then run your test again.
452632
The polarity is correct. This unit will not charge a dead battery. It only outputs enough power to maintain a charged one. You will need a plug-in style charger that outputs about 14 volts at approx. 2 amps for 6 hours or so, then test the battery. Charge it at a low rate to try to revive it. If it comes back and holds charge, it should read about 12.8 volts fully charged.
508363
Have your battery & charger tested. If ok, must be a bad connection and should be returned
894578
you have to charge the battery case first, if it id not coming on it does not have a charge unless its defective