Check charging system warning

[dadamaja]

Starting to get this warning every morning when I'm off to work it seems to go away when I step on the gas. He comes back but it doesn't if I take off and go a few feet. I'm wondering if my alternator is about to go, belt has good tension and it's almost time to get replaced but it looks good. Battery is about 2 and a half years old and they have a fair amount of corrosion on the posts.other than that it runs flawless. Anyone experienced this problem?

Sent from my Samsung Galaxy S®4

 

[BIG GREEN FORD]

Your alternator has two ways of charging. High rpms and low rpms. You can clean the terminals Its going to be better for the battery
I'm positive its your alternator

 

[BIG GREEN FORD]

Also you can disconnect the positive battery terminal while its running and see if it dies or keeps running

 

[Bedrck47]

Your alternator has two ways of charging. High rpms and low rpms. You can clean the terminals Its going to be better for the battery
I'm positive its your alternator

Does this mean that it doesn't charge at any other RPM's other than high or low

 

[Bedrck47]

what year is the expy and how many miles does it have? has the alternator ever been changed?

kindly update your signature with information on your expy year model engine can do this by going to the user CP section

 

[BIG GREEN FORD]

Does this mean that it doesn't charge any other RPM's other than high or low

It means its only charging in high rpms

 

[Bedrck47]

Your alternator has two ways of charging. High rpms and low rpms.

what would you consider high and low RPM's

 

[Bedrck47]

dadamaja

three things to check
1st check the battery voltage with engine off and all doors closed and all lights off. post voltage

2nd check battery voltage with the engine running at idle and post voltage and RPM's

3rd run engine approx. 1500 to 2000 rpm and check battery voltage post results

 

[BIG GREEN FORD]

To me low rpms are 500-1000 high to me is 1500-2500

 

[Bedrck47]

Based upon your description of your problem I would not assume your alternator is bad
without doing proper troubleshooting FIRST.

You state the there is a fair amount of corrosion on the posts, Clean the post and cable connectors with some baking soda and water then use a small wire brush to clean them.

Next check the battery voltage as I suggested above

Get back to the forum after you done the above.

If indeed you need a alternator now is a good time to check prices out and possibly order a replacement or repair parts

 

[Bedrck47]

To me low rpms are 500-1000 high to me is 1500-2500

So based on your other post do I take that to mean that the battery doesn't charge between 1000 and 1500 RPM's 0r over 2500 RPM's

 

[BIG GREEN FORD]

Its not charging when its idling

 

[Bedrck47]

Its not charging when its idling

FOR YOUR INFORMATION
Pic 1 was taken with the engine off key on doors closed
Pic 2 was taken with the engine at idle 13.8 volts
pic 3 was also with the engine at idle 13,7 volts
pic 4 was taken at 1934 rpm's 13.6 volts

battery voltage with engine off key out was 12.7 volts


BIG GREEN FORD
so based on these picture when was the battery being charged or not being charged

 

[BIG GREEN FORD]

There all charging exempt when it was off. Of course. From the pictures

 

[dadamaja]

what year is the expy and how many miles does it have? has the alternator ever been changed?

kindly update your signature with information on your expy year model engine can do this by going to the user CP section

05 Eddie 5.4 148000 bought it in 2011 with 105000 from what I can tell everything is original, only things that I changed myself were the plugs and cops. I'm gong to try cleaning the posts off and check the voltage

Sent from my Samsung Galaxy S®4

 

[Bedrck47]

Its not charging when its idling

THEN HOW CAN YOU STATE THE ABOVE

FOR YOUR INFORMATION
• A functional charging system should produce between 13.5 and 14.5 or more volts while idling.
• A voltage of less than 13.5 means that your alternator isn't producing enough current to charge the battery.

 

[Bedrck47]

05 Eddie 5.4 148000 bought it in 2011 with 105000 from what I can tell everything is original, only things that I changed myself were the plugs and cops. I'm gong to try cleaning the posts off and check the voltage

Sent from my Samsung Galaxy S®4

Kindly post those voltages then we can better determine if the alternator needs to be replaced. Rather than just an un-informed guess

 

[BIG GREEN FORD]

then how can you state the above

for your information
• a functional charging system should produce between 13.5 and 14.5 or more volts while idling.
• a voltage of less than 13.5 means that your alternator isn't producing enough current to charge the battery.

for your information i know this!
Stop being a a$$ about everthing i say

 

[Bedrck47]

if you know all of this then why did you say "Its not charging when its idling"

and then when you looked at the pics I posted you agree that all but the first pic showed charging

 

[Bedrck47]

Sorry if you think I am being an a$$ but when someone gives false statements It only adds to the confusion to the original poster

You stated to the OP " I'm positive its your alternator" but how can you tell him that without troubleshooting the system.

IMHO the only good advice you gave him was to clean the battery terminals.
you need to go back to school and learn or improve your electrical troubleshooting skills or leave those question to those that are better informed than you are