battery not charging question

chacho44

chacho44

Forum Member
Having some trouble on my 03 escalade. Reads battery is not charging, battery and alternator show that they are good still. I cleaned the connections and still reads battery not charging. Any suggestions what else it can be or someone dealt with this problem. Anyone help this is my dd
 
The ipc is showing it's not charging? What's a voltmeter show at the battery? Is the plug on the alternator in good shape ?
 
How many volts on the battery when the truck is running? I'm guessing alt. isn't putting out enough juice.
 
Im not near the truck anymore. But ill check tomorrow, I charged the battery earlie to 96 percent hooked it all up let the truck run for 10 minutes and it still read battery not charging and voltage on the cluster read 5-6 percent.
 
If the alt is charging, it might be the regulator in the alt, it might not be communicating with the cluster, starting in like 2002 they went to an intelligent regulator
 
Took the alternator to auto zone for a bench test. Read fine, ill have to check the plug on the cluster tho. Truck is an 03
 
So its not charging the battery? Put a direct positive feed from alt lug "+" to the battery "+" and retest.
 
what does the dvom say at the battery , do you know for a fact its not charging, do you have B + at the generator lug , could possiblily be pcm
 
chacho44 said:
Took the alternator to auto zone for a bench test. Read fine, ill have to check the plug on the cluster tho. Truck is an 03
Click to expand...

most testers wont show a communications error, fyi


I see this more often when a j/y alt is used(older alt, newer truck)
 
Have you done a voltage drop test? 0.3V on the positive side and 0.1V on the neg. DVOM lead hooked to the batt + term and the other to the alt + term. if its over .3 then you have a connection eating voltage. Neg side-DVOM lead to the neg term and the other to the engine block gnd. less than .1 v should be consumed. When performing this test have your dvom in the volt setting NOT the continuity.
 
Also, check all of your grounds. not only look at them but measure the resistance from the cable to the bolt and cable to the area its bolted to. If there is excessive resistance on one ground voltage with take a different path and could cause erroneous faults or readings in the electronics. This goes for engine/trans, body and module grounds... All it takes is a little corrosion from the alt to engine block, a high resistance in a ground cable or one that is hanging by a thread.
 
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