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Instaled new alt.& voltage reg. still not charging on her 1963 f 250

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This truck came equipped with a generater, so it has been changed over to alternater, possibly wiring problems.

Posted on Aug 01, 2008

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Battery light alternator


The Charge lamp comes on with the Alternator fails to keep battery charge going. (lots of way to fail, and ALT Is 100% good) it's a system. each part of it must be good, end to end.
so...
i put my voltmeter across battery, i start car, i see 13.3 to 15vdc, alt is good.
no? , i see now, 12.2v. ALt is dead, (i didnt say bad) and battery is sightly discharged, 12.6v is charged. (key off, rested voltage)
This 12v tells me the ALT is shut down. only why is the question.

how can any charge system fail,
bad battery tops the list here, they LOVE to fail.
1: belt slips.
2: belt missing
3: bad alt.
4: bad wires to ALT . (corrosion on any wire or lug)
5: fuses blown , any listed below.:
your alt is not an ECU controlled, alt ,its 100% self contained

did you ever remove the ALT and blow the 100 amp fuseable link
the first step of any alt pul, is the pull the NEG, battery lug or BOOM.

im logged in to alldata.com so can you.

and what do i see.
a 5 wire ALT. one is the frame ground, so it must not be rusty or..... it fails. frame to engine block. no rust here.

wire L , yellow.goes to dash LEDs (alt failure idiot lamps) (this works)
wire. S white goes to ALT 5a fuse, is it blown?
wire :B B/G color, goes to the 100 amp link fuse. (blown>?)
wire IG Red-white, goes to a fuse marked 10A gauge.

i think the IG wire is the voltage sense wire.
no sense, no charge. I think the whole I/P dash cluster goes dead when this fuse blows.

The S wire is the boot strap voltage sense, it wakes up the regulator .
if open , the reg stays asleep, as does ALT.
Alternators can not self start, the regulator has boot strap device
that cures that. called self excitation. so this wire is critical.
All wires except the L wire is critical. in this case.

the B wire is the big wire, it charges the battery . 50amps or more..

any of the 5 paths open , kills the ALT dead.
The REG inside the ALT can also shut it down.
eg: battery bad, with huge cell resistances. total.
eg: overvoltge for any reasons. including attempts top run car with no battery, (dont ask)
eg: over current (battery cells 1 to 6 shorted) or 25 KC lamps added.
eg: over temperature shut down.

that is about it.







Dec 31, 2013 | 2003 Toyota Matrix

1 Answer

Ive got a 1988 ford ranger,it strated to stall not run popped when tried to apply fuel,went bought fuel filter pump,install samething,pull voltage regulator plug truck runs fine, so go buy new alt with...


Interesting.
You may need a wiring diagram for the engine.
Unplugging the regulator turns off the alternator which should not affect the ignition system. Unless it is over charging somehow. Or the alternator load on the engine is causing a missfire to be worse.
Its possible you have a ground problem somewhere too.

Jun 29, 2012 | 1988 Ford Ranger

1 Answer

99 elantra alt not charging battery' installed new alt and battery and fuse good and still no charge on battery


check 10 amp ECM fuse. Your alternator voltage is regulated by the ECM. If the fuse is good, consider replacing the ECM.

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Oct 05, 2010 | Hyundai Motor 1999 Elantra

1 Answer

Think that the alt is not chargeing have changed the alt and voltage reg


have you checked the charge lamp relay? they have been known to go bad.

Feb 26, 2010 | 1983 Toyota Pickup

1 Answer

Not charging


First tell me why you don't think it's charging.
Because of the voltage reading you are getting at the battery terminals? The range you want is between 13.6v to 14.2v. The higher the voltage the lower the amps. and true the other way, the lower the voltage the higher the amps. If you get a reading of 13.6v or lower, the alt is nearing or at max output. An alt can only run at maximum for around fifteen minutes and it will start slinging solder from overheating. It's a good indication the battery is either totally dead or junk. Charging above 14.2 the alternater is running wide open and is only putting out high volts which will cause the battery to boil , in turn destroying it. This is a bad alternater. All alternaters have integrated voltage regulater with the exception of ver few of the earlier ones. You cannot test an alternater by removing a battery cable to see if the engine keeps running without taking great risk of damaging the alt, regulator. So tell me why you feel it isn't charging. Remember an alt is not made to charge dead batteries. Their sole function is to maintain the battery charge. Without a battery, the alt won't last 10 seconds.
Hope to hear from you and good luck.

Sep 23, 2009 | 1986 Chrysler LeBaron

1 Answer

A short in the charging system


Get your alternator checked - probably the brushes are worn out.
The voltage regulator is generally an integral part of the alternator brush-holder assembly.

Jun 20, 2009 | 1993 Ford Aerostar Extended

1 Answer

I replaced the alternator but wont charge i had it checked before


volta regulater is in the pcm ( power control modual ) you need a pcm or a external voltage reg . the reg is what controls the alt out put

Jun 02, 2009 | 1988 Chrysler New Yorker

1 Answer

Hyundai Grandeur XG 3000 Alternator charges intermittently


you can bench test it but u need to have something to turn the alt up to speed but thats not needed check your voltage make sure its between 13.00 to 14.85 anything under that then the alt is not charging anything over that then the reg is bad and if the reg is bad then just replace the alt the cost of a reg is more then the alt brushes can be found at any repair shop for starters and alt let me knoe how it goes

Dec 07, 2008 | 2001 Hyundai XG300

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