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2004 focus zx3 not charging. Replaced alternator, bur

2004 focus zx3 not...

2004 focus zx3 not charging. Replaced alternator, bur voltage shows flat. diagnostic says alternator providing charge

Mechanic's Assistant: Have you done a battery test? Has there been any change in headlight brightness?

Battery shows 11 volts. no change in brightness, no change in engine rpms when adding electrical loads

Mechanic's Assistant: Are you fixing your Focus yourself? What have you tried so far?

Yes. Had replaced battery last week. alt light was on. changed alternator last night, brief period after startup , no charge light, less than 15 sec, light came on.

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Returned to parts store, their meter showed no charge from new alternator

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Answered in 3 minutes by:
8/30/2017
eric remington
Category: Ford
Satisfied Customers: 312
Experience: mechanic/service advisor at topline auto
Verified

hello my name is ***** ***** you need to charge battery with a charger take to store and then hook up volt meter and tell me what reading you get

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Customer reply replied 5 months ago
11 volts

yes it needs tobe 12.6 volts so you need to charge it

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Customer reply replied 5 months ago
ok, if I do that will the alternator start to provide a charge?
Customer reply replied 5 months ago
Are you there?

it may be defective sometimes aftermarket alternators remanufactactured can be defect

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you need to check the field wire input to the alternator and make sure thae battery wire at the alternator is getting current

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Customer reply replied 5 months ago
How do I do this?

if its run cause a no charge situationning and only reading 11 volts (provided the battery is good) then its not charging I have seen bad batteries

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I have seen bad batteries cause a no charge situation

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c​an you access the leaddds to the alternator

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Customer reply replied 5 months ago
I can see them, and I can get to them

how old is battery

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do you have a volt meter test light

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Customer reply replied 5 months ago
1 week

you should get it charged if it reads only 11 volts when off

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Customer reply replied 5 months ago
I understand that. If I do that will the alternator begin to provide a charge?

can I have the vin number so I can tell you what wires to check...but test the battery wire first is that hot where did you get alternaotor from

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no it will not charge....but it still needs to be done...your alternator is not a battery charger it needs to be fully charged when you get your other alternator istalled if the the red wire at alternator does nt lite up with test light then there is a fuse fusible link issue

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when did first alternator die?

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the alternator has to work very hard to charge a bettery back up from a low charge istuyation

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Customer reply replied 5 months ago
3fafp31z24r106885 hot lead at battery shows 11 volts to ground. no key on
Customer reply replied 5 months ago
alternator tested flat output last night

people get a jump start put on their ac headlights stereo boom box and then next wekk alternator goes out cause it got fried...make sense

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ok is red wire at alternator getting juice?

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Customer reply replied 5 months ago
I'll have to check. Getting juice with key off?

I will look up field wire color that needs to be checked while vehicle running

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Customer reply replied 5 months ago
Thanks

probably doesn't make a difference but if it does nt come on test light then turn key on and ck

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recheck

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so if red wire is getting juice and field wire getting juice, test while running, the alternator no good. battery is new so that not an issue.. I will tell you what color wire that is momentarily....field wire

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Customer reply replied 5 months ago
How do I check the field wire output?
Customer reply replied 5 months ago
I check the red wire at the alternator case, to the battery ground (black term at battery . Ant the field wire is checked tha same way?
Customer reply replied 5 months ago
The red wire show 11 volts tested from the alternator case connector to the black wire at the battery

how many wires go into the electrical plug? and what are there colors...just comparing

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ok so the big fuse not blown...so when did first alternator die

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field wire ck with engine running

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very rare that field wire missing current but still should be checked more thaqn likely alternator is defect....where did u buy it when did first one fail

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Customer reply replied 5 months ago
three pin connector to alternator casing. red, blue gray. disconnect battery. red wire shows continuity to battery lug end of red battery wire key off. no cont from blue or grey. no cont from blue or grey to ground, key off, or key on.
Customer reply replied 5 months ago
first alternator died last week.tested no output yesterday. replaced today. no output after installation. will attempt to bench test next

t​he computer provides current to field wire while engine runs...trying to see which wire it is. of the three at least one should be hot..positive voltage

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I​ sent the schematic if you are getting pos voltage while running to either these wires then alternator defect. plz rate me as my compensation depends on it and don't forget to charge battery to full state of charge. where did you purchase alternator?

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ck all fuses fuse 10 in battery junction box

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the red wire runs off fuse 10

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the regulatgor is a problem of fords....that is built into alternator....now I remember

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that is likely the issue....these rebuilt alternators don't replace them...piisses me off

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the testing procedure in Mitchell seems to indicate that if you have no dtcs it is safe to assume that (provided big and little red wire are hot) the alternator is at fault. so computer would set a code if field wire inpiut missing that is what I'm getting from it. so ck and erase trouble codes.you can erase them and with everything hooked up ck for any codes as well but if u are getting field wire input and little and big red wire are hot then its an alternator probably the regulator...and I ve been doing this for over 30 years

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don't forget to rate me thanks...eric

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field wire gets power when engine running

eric remington
Category: Ford
Satisfied Customers: 312
Experience: mechanic/service advisor at topline auto
Verified
eric remington and 87 other Ford Specialists are ready to help you
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t​hank you for using just answer. If you can find a new one with a new or newer regulator...that would be good. or take it to a shop that specializes in alternator rebuilding...hard to find

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eric remington
eric remington
eric remington
Category: Ford
Satisfied Customers: 312
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Experience: mechanic/service advisor at topline auto

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