[Brendan Schneider]

My 07 Envoy has a battery light and service charging system on the dic. The alternator is charging just fine. Why?

 

[Ravalli Surfer]

How do you KNOW it's charging "fine"?

Who told you this information?

The alternators in our TB's are energized by the computer ... so I imagine a full computer scan has been done to confirm the output and IF it's good ot not ... right ?

 

[Brendan Schneider]

I cleared the codes and it went away

 

[Brendan Schneider]

The code was B1513

 

[Ravalli Surfer]

You sure? That's a mighty strange code for which to change the alternator ...

What are the Possible Causes of the Code B1513?

• Faulty Driver Door Handle
• Driver Door Handle harness is open or shorted
• Driver Door Handle circuit poor electrical connection
• Faulty Body Control Module (BCM)

Checking a bit further though ---

DTC B1513 Charging System Volts Low

. and if the second reason is what you replaced an alternator for --- did you test the AC ripple on the DC output to confirm that the alternator was indeed bad? You can get fooled pretty expensively if it's just a bad connex or a dirty pin somewhere --- or <shudder> a bad diode trio.

But you dood it and got froggy and bought the alternator --- it might or might not be the whole answer --- but if you were feeding the battery with any AC coming outta that alternator for a bit of time ....

Batteries do NOT like AC and they will raise their heads later on (or sooner, mebbee) and just die.

This is why it's imperative to ...................................... ask first of the people who don't have any interest in your money ....

DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE DIAGNOSE............................................................................

........AND THEN CHANGE OUT THE OFFENDING PART.

 

[PiusGG]

My 07 Envoy has a battery light and service charging system on the dic. The alternator is charging just fine. Why?

Are you sure its charging is normal?

 

[Brendan Schneider]

I don’t know the battery light has been off since and everything is fine