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What would cause a battery to drain and not charge with the headlights on but charge up fine with the lights off?
Wiki User
∙ 17y ago
Sounds Like Your Voltage Regulator Is Bad. This Is Inside The Alternator On Most Cars. You May Have To Remove It For A Test. But Lots Of Parts Houses Can Test Unit On The Car. Also Your Battery May Be Weak. Start With The Alternator First. Good Luck The alternator could be marginal. If one or more of the diodes are faulty the alternator will not be capable of producing enough current. You should be able to have the alternator tested at a local auto parts retailer such as checker, Kragen or Auto Zone. If a diode is faulty those tests can certainly detect it.
Wiki User
∙ 17y ago
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What will cause a ford f150 not to have any power no headlights no dash lights like i don't have no battery or either my starter is bad but its not what can cause this to happen?
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Possible ground issue at the taillights.
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Most likely a fuse.
What would cause the engine to quit on a Ford F-150 when the headlights are turned on?
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Why would the headlights of a 1988 Honda LXI be weak on dim and the bright lights only work on the right side?
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