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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Alternator doesn't charge brand new battery but no codes or

Customer Question

alternator doesn't charge brand new battery but no codes or trouble light even though dash trouble lights show on accessory mode no OBD2 codes showing
2005 ford focus 2L PZEV
Submitted: 3 months ago.
Category: Ford
Expert:  david craig replied 3 months ago.

Hi Im David. First thing you need to do is read the voltage at the large cable on the alternator. it should be around 14.4 volts dc......let me know what you get. thanks

Customer: replied 3 months ago.
How do I get to it? I can see two large wrapped cables coming up maybe from the alternator but they are not bare.
Customer: replied 3 months ago.
When car is running voltage at battery with cables connected is only whatever battery has.
Expert:  david craig replied 3 months ago.

the cable to the alternator will probably have a rubber protective cover over the terminal to keep moisture off of it, you can just stick the meters probe right through it. if the battery voltage is only 12-12.5 while running. then your alternator is bad. or the cable between the alternator and battery is bad. that is why its very important to check voltage at the alternator

Customer: replied 3 months ago.
I can't get to the alternator terminals. I have no lift.
Customer: replied 3 months ago.
Why no codes? Why no warning light when running?
Customer: replied 3 months ago.
Can I monitor alternator voltage with OBD2?
Expert:  david craig replied 3 months ago.

you wont have a code for a bad alternator. but you should have some kind of battery light that comes on........

Customer: replied 3 months ago.
I have zero trouble light or warning light when running car, although my trouble lights DO work.
Expert:  david craig replied 3 months ago.

no , you can only monitor battery voltage

Customer: replied 3 months ago.
I don't have smart phone to tap here.
Expert:  david craig replied 3 months ago.

when you turn the key to the on position and all the indicator lights come on, is one of them saying batt or alt?

Customer: replied 3 months ago.
Just type on website, please.
Expert:  david craig replied 3 months ago.

????

Customer: replied 3 months ago.
Sure, when I just turn the switch key to on the trouble lights show, including the batter +-
Customer: replied 3 months ago.
Why don't I get an alternator/battery light while running??????????????????
Customer: replied 3 months ago.
Will disconnecting battery terminal while car is running determine if alternator is charging or not? When I disconnect either post, engine dies instantly telling me alternator is not charging new battery. However, WHY NO LIGHTS ON DASH????
Expert:  david craig replied 3 months ago.

I am looking that information up right now

Customer: replied 3 months ago.
You haven't sent me any message on my phone except that you have responded.
Expert:  david craig replied 3 months ago.

what are you talking about? im not sending any messages on anyones phone..............i would like you to look in the fuse box in the engine compartment there should be a 10 amp fuse for the alternator im trying to find out how it is labeled

Customer: replied 3 months ago.
Neither of my car manuals say alternator fuse. I even have shop repair manual, and it doesn't in either fuse area, inside car or engine, anything to do with charging or alternator.
Expert:  david craig replied 3 months ago.

it probably says something else like batt 1 or batt 2...im trying to find out

Customer: replied 3 months ago.
There is no batt1 or batt2 fuse or relay.
Expert:  david craig replied 3 months ago.

ok. it should say generator

Customer: replied 3 months ago.
We found a good bat sense 1 amp fuse that was goodl
Expert:  david craig replied 3 months ago.

is this what your fuse panel label looks like?

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