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Why doesn't the alternator light come on when key is turned to on?
Wiki User
∙ 16y ago
Could be a bad bulb
Could be a bad voltage regulator (circuit not opening on engine shut down)
Wiki User
∙ 16y ago
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Why does the battery warning light come on when the ignition is switched off?
I had this problem on my disco 1. Turned out to be the alternator, which was replaced and the problem was fixed.
Please explain the charging circuit in automobile. 1. How does the charging light comes on when ignition switch is turned on 2. How charging light comes on when alternator is not or less charging?
When the ignition is turned on, battery voltage passes down the wire to the alternator to 'excite' the alternator when the engine starts. When the engine starts and the alternator generates a voltage, the light is extinguised by the charging voltage cancelling out the battery voltage coming down the wire. If and when the alternator completetly fails the the light will come back on as there is no sancelling voltage. if the alternator produces a voltage lower than the voltage from the ignition switch then the battery light will glow.
What causes the alternator light to come on?
It usually means that the alternator isn't charging properly.
Battery light was on and checked to see if it was the alternator and the alternator was bad have not fixed the alternator and now the battery light has not come back on what could be the problem?
There is no problem...the problem was the alternator. You have fixed the problem.
Why has the battery light come on after changing the battery alternator and starter motor?
Is it charging, if not have you checked wiring to alternator.
Why does brake light and battery light come on at the same time in an eclipse?
Your alternator is not charging.
Why does the alternator light come on when you shut the key off?
The alternator light goes out on starting the engine when both the ignition source, and alternator are producing positive voltage. When the ignition switch is turned off, the engine, and of course, alternator are still turning momentarily. The alternator is then still producing positive voltage, while the 'off' ignition switch has assumed a negative state, creating a closed + - circuit, allowing the lamp to light. This is a very normal state, and has occurred for many decades, even back to the days of cars running generators, prior to the alternator. Absolutely nothing to fear.
What would cause the alternator light to come on and off On a 1989 Buick Skyhawk?
A failing alternator with sticky or worn out brushes.
Will battery idiot light come on if battery is low but alternator is ok?
No. If the alternator is working fine, the battery power is not used.
Why doesnt the headlight taillight and dashlight come when the light switch is turned?
Probably a bad headlight switch. Also may be the power feed wire for the headlight switch. Check both.
What would cause the alternator light to come on and off. On a1989 Buick Park Avenue.?
Something can be taxing the work of the alternator, or the alternator can be weak and needs replaced.
Why does the battery charging system warning light come on?
The alternator switches off
