Power drain i have a bronco 2 i have changed the altinator and starting silnoid and battery twice now i had been looking for the voltage regulator and the only one that i see is on the alternator where would it be located at
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Defective B+ battery cable from Alternator to battery
Poor Charging System ground(s)
Defective PCM wiring/connection to Alternator
Defective Voltage Regulator
Large Parasitic battery drain
Defective Battery and/or cables
Check the condition of your battery cables - are they corroded/have broken wire strands? Also check where the negative battery lead attaches to the engine/bodywork.
Check all the wiring for breaks and tightness - a small earth wire can be loosened and retightened to create a better earth. Corroded power wires can struggle to supply the correct voltage - remove and clean whatever you can find.
It's unlikely to be your alternator as you say it has been checked - the voltage regulator is built into the alternator so it must be okay.
A parasitic drain can be difficult to find. Try switching off everything - radio, heater ... the next time you start the car. If you know somebody who has a voltmeter and knows how to check for a power drain .. ask them.
The link below shows a Saturn PCM (it may not be your actual model..). Check all wiring around the PCM
The only time I've had a problem with an alternator repeatedly failing is due to improper shimming and the pully wasn't aligned with with the cam and crank shaft which in turn put a tweak in the alternator pully and strain on the bearings. I must point out, this was on a 1978 Chev with V belts. The one that failed a week later, did you have it tested to be sure it failed? Same question for the most recent one. If the alternator are not indeed failing, I'l look to either the ECM or the battery cables/wiring from alternator to battery.
you have a pcm controlled voltage regulator... in other your voltage regulator is built into the pcm... you can either replace the pcm or have the voltage regulator reinstalled on the alternator... the latter is cheaper most of the time... its not as simple as unbolting it from the pcm and its not something a home user can try to do... better to take it to the professionals for this. try a good alternator and starter rebuilder in your area... then and only then can you start testing to see why the battery light comes on whenever
HELLO, I'M PRETY SURE YOU ARE HAVING A PROBLEM WITH YOUR VOLTAGE REGULATOR. PROBLEM IS THAT YOUR REGULATOR, IS INTERNAL IN YOUR ALTINATOR AND THAT IS WHERE THE VOLTAGE REGULATOR IS LOCATED. TAKE YOUR ALTINATOR TO YOUR NEAREST AUTOPARTS STORE AND HAVE THEM TEST IT. HOPE THIS HELPS YOU.
I would have someone else check the alternator, and the voltage regulator. a simple check you can do yourself is while the engine is running, take a non-magnetic screwdriver and hold it to the back of your alternator(right in the center, there is a metal nub sticking out) there should be a strong magnetic pull if there is none, it is one or the other, probably the voltage regulator. I think your car is old enough that you should be able to disconnect the battery cable with the car running, if it dies, then you have charging problem, if it don't then something else is draining your power, it would have to be a very bad short, and you would smell something burning.
possible problems are endless, could be the voltage regulator, could just be some sort of drain in the electrical system ie a dome light that is burnt out but maybe the switch is in the on position. when you jump it it starts up? Does it click when you try and start it? It could be the starter or starter solenoid and not a power issue. hope this helps
Change voltage regulator. Does the battery take a charge from a charger? If not, replace battery. If it does, then regulator is faulty. If still nothing, return alternator to place of purchase, and have it checked.
hi if your altinator went bad then when you jump it, it will start then die once the juice has ben used in the battery,it sounds like your altinator has gone bad.get a jump and remove the posative battery terminal when the car is running.if it dies instantly your altinator is bad.