[Petet1]

Hello, I have a 2004 Camry with a 3.0 engine , I bought it from an auction so it has been sitting for about 3 years, the problem I’m having is that when I start the car the alternator is charging fine 14+ volts, but gradually goes down within 5 minutes drops less than 12 volts , and the car stalls, I have replaced the alternator and battery and still have the same problem . Anyone can help ?

 

[Kingdom934]

Welcome to TN!

If it's dropping, wondering if there is some kind of wiring ground issue. I've heard of issues with the alternator doesn't charge and it was caused by a bad ground,... although usually that doesn't charge the battery right off the bat. Even if the alternator does stop charging, it should still run until the battery discharges pretty significant....longer than 5min though unless something else is going on.

 

[cj1]

Can you measure for voltage drops from positive bat to positive alternator.
Also from negative bat to alternator case .
Do this when you have 14v.
Drops should be less than .2v.

 

[Petet1]

Thanks for the tip , I did the voltage drop test and it’s normal, about .2v the positive and .1 v the negative, also all fuses are good, I’m stuck I don’t know what to check next

 

[cj1]

Ok, measure/monitor the v directly on the alternator.
Does it start at 14v and go down to 12v after 5 min?

 

[Petet1]

Ok, measure/monitor the v directly on the alternator.
Does it start at 14v and go down to 12v after 5 min?

I have did that too , directly from the Alternator, it started 14v and slowly dropped down to 12

 

[cj1]

ok, what is the idle speed and does it drop as the v drops?

 

[cj1]

ok, what is the idle speed and does it drop as the

 

[cj1]

Note when testing the bat voltage do it from the the center of the battery post since could be resistance between the connector and post.