What causes an ampmeter to register discharge when the engine is accelerated?

Answer 1

It is possible that there is more than one reason for the symptoms you describe. However, this problem is fairly common and can be caused by the fact that the belt driving the alternator maintains a decent grip at "normal" rpm [revoultions per minute], but begins to slip as the engine is accelerated. Under the right conditions, the slippage will result in the rpm of the alternator reducing to almost nothing, which results in the electrical output being reduced by a relative amount, and if the slip should result in the alternator comming to a full stop, then there would be no electrical output. Check the alternator drive belt and pulley[s] for signs of "glazing", polishing, slippage, and for proper tension adjustment. Good luck. generally this indicates that the alternator neds repairing Answer 2 hardly ever is correct. IF the alternator is working normally at normal speeds and engine rpms, then that means the alternator is working, and does not need repair. answer 3 is wrong the alternator and battery make up the echarching circuit in a vehicle.with a bad alternator the car can run at idle. when revved up a bad alternator does not supply enough current to run a vehicle and charge a battery when the battery is low,especially in the new vehicles full of electronic crap, the alternator wont keep up with the demand, thereby draining the battery. then the car dies