Battery Light's False Alarm Car Runs Perfectly

Could the cable from the light to the alternator be down to earth (unlikely in a fibreglass car but you never know)? ... running - light comes on I'd say this isn't uncommon. First step is the measure the voltage at the battery with the engine running and alternator charging. Should be ... Your engine is off, at this point. When your engine is running and your alternator is charging, the voltage from the charging alternator is felt ... Don't unplug the battery while the car is running. Almost positive you'll need a new alternator. Keep driving it and you'll know for sure: The ... Check the PCM for fault codes, there are other charging system problems that can cause the charging system light to illuminate. 1 Like. This will trigger the battery light but show 14-14.7v at the battery terminals. A normal modern alternator like yours is externally regulated ... It will also cause the battery light to come on because the alternator won't be charging. As the battery dies, the other lights may appear and ... It is not common but corrosion can set in inside the battery cable sheath at the battery terminals and cause all sorts of issues with an ... Use a multimeter and check the alternator while the car is running. If the alternator is less than 13 volts than the alternator is crap. The ... Over time, battery voltage will drop lower and lower and you won't be able to start car. Not battery's fault if it's not being recharged. Get ...