Voltage Spikes

Jim Kaekel · 07-12-2011, 04:42 PM

I recently "blew" the voltage regulator out of a late model GM CS121 alternator that was on my Olds Stocker. Voltage went in excess of 16 volts after only 2-3 runs after installation. I swapped it back out for the original early internally-regulated Delco unit that was OEM and all has been fine so far. I was told that it failed due to voltage "spikes" in the system. Could this be correct and what could be the cause of voltage spikes? I have heard that a bad battery could cause this?

07-12-2011, 04:42 PM	#1
Jim Kaekel VIP Member Join Date: Jul 2002 Location: Michigan Posts: 1,226 Likes: 133 Liked 529 Times in 107 Posts	Voltage Spikes I recently "blew" the voltage regulator out of a late model GM CS121 alternator that was on my Olds Stocker. Voltage went in excess of 16 volts after only 2-3 runs after installation. I swapped it back out for the original early internally-regulated Delco unit that was OEM and all has been fine so far. I was told that it failed due to voltage "spikes" in the system. Could this be correct and what could be the cause of voltage spikes? I have heard that a bad battery could cause this? __________________ Jim Kaekel 3836 STK