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Voltage regulator keeps showing that it is bad. I replaced…

Customer Question
voltage regulator keeps showing that...
voltage regulator keeps showing that it is bad. I replaced the alternator and battery.
start the gauge goes past 14; then when you drive it for a while it drops down to 12 1/2 volts, shut it off; and start it up and it goes back past 14.
Submitted: 3 years ago.Category: Chevy
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Answered in 7 minutes by:
6/15/2015
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 18,026
Experience: 15 years GM master tech
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I am sorry for the long waitcan you tell me the year and model and engine size ?
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Customer reply replied 3 years ago
2008 Chevy Avalanche
5.3 l
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
changing the alternator and battery made NO difference at all either way ?
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Customer reply replied 3 years ago
for 1 day and it went back to the same: could it be the remote start?
a couple weeks ago the horn started going off and the only way to stop it was to take the fuse out for horn..... took it to Wilson Chevrolet, where we bought it and they couldn't find the problem.
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
with the alternator and battery being new these type of issues end up being a computer issue with the ECM or the BCM
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Customer reply replied 3 years ago
(Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call. Let me know if you need more information, or send me the service offer(s) so we can proceed.
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
the best action to have the ECM and BCM programming updated first
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Customer reply replied 3 years ago
what is ECM & BCM
Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
ECM is the engine control module which runs the engine and the BCM is the body control computer which runs most of the inside things the ECM tells the alternator when to charge and how much to charge off of load inputs it receives and the BCM will tell the ECM when other loads are turned on in the truck so the ECM will up the charging
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Chevy Mechanic: Gary, Chevy Technician replied 3 years ago
usually updating the programming with a programming scan tool of the ECM and BCM is the next stepif it still acts up then the wires from the alternator to the ECM need to be checked next if those wires check out then either replacing the ECM or BCM would be next
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