Diodes should allow current to pass in only one direction, but a bad diode will keep the charging circuit open even when the engine in not running, allowing the battery to go dead. This often happens overnight.
Wiring Problem
Even when the alternator is functional, if the wiring between it and the battery is damaged, it won't keep the battery charged.An alternator that's not providing Sufficiently aptitude can avow a battery to flight down. According to Prestolite electric, an alternator producing less than 13.8 volts of capability at indolent is not producing Sufficiently now to charge the battery fully and needs to be replaced.
Bad Diode
A malfunctioning diode in the alternator can effect a parasitic drain on a car's battery.Recharging a machine battery won't avail whether the van has a defective alternator.An automotive alternator is a Slogan that converts endowment from the engine into electricity, which is used to charge the machine's battery. In some cases, nevertheless, the alternator can really remove the battery, causing expressive problems.
Insufficient Alternator Voltage
A broken ground wire on the back of the alternator, a loose battery cable, or a faulty or dirty cable could prevent the alternator from providing an adequate charge.
