How To Check If Alternator Is Not Charging Battery. In that case you can test the alternator by touching the positive multimeter probe to the positive terminal on your battery and likewise the negative probe to the negative terminal on your battery. The orange wire is B and the black wire is B-.
For the easiest method to check your alternator simply turn on the headlights to your lawn mower or outdoor power equipment. Set your multimeter to voltage and ensure its adjusted to 20 DC volts or if your voltmeter does not have. Shop Great Deals On Batteries Light Bulbs Chargers Device Repair Services.
Again touch the same location you did.
When the engine is at idle 140 -138 vdc. Crank the engine while probing the battery posts. Test the battery voltage at rest this should read between 125 and 128V on average. The orange wire is B and the black wire is B-.
