Question about 2003 Cadillac Escalade
I just put on a new alternator on #3 in 5 months. each time I have the none charging old alt. checked it shows to be good- now this new one is not charging from the get go
If the alternator passes the bench test but is not charging on the truck, you have a problem in the wiring between the alternator and the battery, or the alternator and the key switch.
Posted on Dec 10, 2012
Who is replacing all these alternators?
Are they New GM pieces or rebuilts of
As they were installed- did they produce the correct
voltage,current under a load test & have no diode
If they never turned on the regulator-- why was that not
Posted on Dec 10, 2012
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Posted on Jan 02, 2017
I would take it back and tell the shop to test the diodes. these vital parts are very important and, some shops look over them like they don't matter. From your description on how it is charging, i can safely say the diodes are bad.
Posted on Mar 08, 2009
You need to take it somewhere that can do a parasitic draw test. Something in the car is drawing power from the battery with the key off. You can do this yourself if you own an ammeter. If you do, let me know and I can walk you through the test.
Posted on Jun 02, 2009
SOURCE: I had a used motor
CHECK POSITIVE BATTERY FEED CABLE TO ALTERNATOR AND CHECK ALTERNATOR FIELD WIRING THEY ARE CLOSE TO THE ENGINE BODY. GO TO AUTO PARTS STORE GET SOME FLEXIBLE CONDUCT PLACE ALTERNATOR WIRES IN IT AND REROUTE WIRES THEY COULD BE RUBBING INTO BODY CAUSING SHORT BLOWING OUT ALTERNATOR.THE CADILLAC 4.6L AND 4.9L ENGINES THE ALTERNATOR IN A TIGHT SPOT CLOSE TO THE ENGINE WHERE THE ALTERNATOR WIRES CAN RUB BODY SHORT OUT.CHECK WIRES AROUND ALTERNATOR CAREFULLY.
Posted on Aug 06, 2010
This indicates a short on the main wires from the alternator. Probably going to the battery or the wrong size battery. I assume you don't believe it is charging because the battery keeps going dead. This is most likely a problem with a short on a wiring harness. While the vehicle is running check the voltage at the battery. If you aren't getting at between 14 and 18 volts while the vehicle is running you have a short between the alternator and the battery on the harness. if you have that voltage then the problem is a short draining the battery.
Posted on Mar 02, 2011
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