How Do You Check If A Battery Charger Is Working. When your Dewalt battery charger is ready to start recharging batteries the indicator light will turn red. Most devices will have a charging symbol come on or a green dot when it is actively being charged.
Several different things can then happen. The second thing you should do after you charge up the batteries is to CHECK EVERY BATTERY CONNECTION. So if you dont have anything connected to your batteries and they have been sitting for some time but still have a good charge on them a voltmeter will show a voltage of 126 volts or close to it.
If the lights get brighter as you rev the engine it means the alternator is producing some current but may not be producing enough at idle to keep the battery properly charged.
The best chargers work intelligently using microchip-based electronic circuits to sense how much charge is stored in the batteries figuring out from such things as changes in the battery voltage technically called delta V or ΔV and cell temperature delta T or ΔT when the charging is likely to be done and then switching off the current or changing to a low trickle charge at the appropriate time. I would check the batteries out first. And your car wont start if you dont say please. Turn the timer on and check for power coming from the timer.
