charging system not working

[brian h]

the truck is a 07 duramax,there is no power at the two small wires at the back of the alternator,battery light and charging gauge is showing no charge,has anybody had problems with no power to the alternator? where does the power come from?are these wires fused?

 

[tex78]

The alter is sent a signal to charge. Not power. Careful with probing test lights around unless u like to buy computers.

Is there power to the main feed back wire to the batterys ??

sent from my htc

 

[brian h]

after i changed the alternator it was not charging,ran the truck for approx 15 minutes then it started to charge and is working fine