         
Part 1 GM ASVR Type Regulator GM started using the ASVR type regulator in OEM production in 1999 on all General Motors vehicles. ASVR regulators were also designed to replace earlier Delco CS series regulators. The ASVR regulator is a computer chip, which is extremely sensitive to voltage spikes. General Motors services manuals stipulate that the battery must be disconnected prior to replacing the alternator with an ASVR regulator. Failure to do so may cause voltage spikes when the B+ terminal is removed and may damage the ASVR regulator. In most late model vehicles the ECM or PCM turns on the ASVR regulator. If a fault code was set when the original alternator failed, the codes must be reset before the new alternator will function properly. If the codes are not cleared the dashboard warning light may stay on. See the vehicle's service manual for proper procedure to reset the ECM or PCM. 
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