Battery Voltage Enigma Solving Fluctuations While Driving

... battery and alternator, the two most common electrical problems in your car or truck! Check out this playlist for more DIY diagnostics tips ... I've been monitoring my voltage while driving because I was having some charging issues, I tightened some battery connections and now I'm ... Reason is, your charger might see it as a short (very high amperage load at the onset). Also, check terminal connections for corrosion or lose ... Get the battery load tested. Only way to confirm battery is indeed good and not having a weak cell only holding a ''surface'' charge. Noticed today my volts are fluctuating while RPM's are near or above 2000 on highway trip. At stop light had battery light come on. Does so at idle or while driving down the road. Tail lights ... I placed volt meter on the battery and showed him the voltage fluctuation. This will cause the voltmeter to fluctuate between 12 and 14 volts as opposed to non-regulated systems that usually maintain a more consistent ... Nope. That pretty much sounds like a dead battery. It sounds as though one of the cells has a short in it, which is causing your rapid ... When the batteries need to be charged, the voltage goes up to 14.4v or so, and when it senses they are charged it drops way down, I've seen 12.9 ... The slower the engine is running and the higher the electrical load is it will cause voltage to drop slightly but if you increase engine RPM the ...