Did you install a new voltage regulator? Is the belt tight? Maybe the "computer brain" is weakening.
If you have installed a new alternator and new battery, check the harness/wiring that plugs into the alternator, it may be corroded/bad connection causing your battery to not be recharged at idle speed; voltage should stay between 12-14.5v range and steady (some momentary drop may occur after turning hi beam lights, etc but it should return to proper voltage after a few seconds), as for the regulator, on most cases it is inside the new alternator so no further adjusting may be required; also, make sure you get the right alternator for your focus-there's like 3 types, the wrong one will cause your dashboard alternator lamp to be lit at all times-replace with right one or higher output if got power windows,seats,etc.Good luck! Buena Suerte!
Not likely, but running the engine with a dead battery can damage some alternators. Always fully charge the battery when installing an alternator.
Two things can happen. 1. the voltage regulator fails so that the alternator doesn't know the battery charge is dropping therefore the battery doesn't get charged. 2. The voltage regulator fails in such a way as to allow the alternator to overcharge the battery which causes the battery to overheat and fail, Sometimes an overcharged battery can explode.
Bad alternator not charging battery? Bad voltage regulator? Blown fusable link?
If you have the wrong size battery in a Cadillac with the northstar will it effect the alternator voltage?
To regulate the voltage flow going to the battery.
the alternator voltage at the battery should be between 12.4voltsv-13.6 volts
Defective alternator or internal voltage regulator is bad.
It means that you have an alternator fitted. An alternator needs an amount of battery voltage to generate electricity. A generator/dynamo will make voltage without a battery being present.
If the voltage regulator (usually located inside the alternator) were to go bad and not limit voltage to the battery quite possilby _yes
either the alternator or the voltage regulator are no good.may also be a bad battery
It means the battery voltage is low. Can be the battery is defective or the alternator is failing.
An alternator has diodes which transform ac voltage to dc voltage so that the battery gets negative and positive current on its poles thus making the battery to be charged.