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cad · 05-29-2025, 10:13 AM

Just spoke with tech support @ Tuff Stuff Performance which is one of the primary sources for the high output @ low rpm CS121 alternators.

He said it is unfortunately common that standard race car wiring and shutting off the master cutoff will zap the regulator.

I purchased another 7937ST and it is working fantastic.

Next time I have to go through a full tech, I will be removing the alternator belt.

Clark

05-29-2025, 10:13 AM	#46
cad Senior Member Join Date: Apr 2009 Location: Omaha, NE Posts: 696 Likes: 198 Liked 91 Times in 51 Posts	Re: alternator Just spoke with tech support @ Tuff Stuff Performance which is one of the primary sources for the high output @ low rpm CS121 alternators. He said it is unfortunately common that standard race car wiring and shutting off the master cutoff will zap the regulator. I purchased another 7937ST and it is working fantastic. Next time I have to go through a full tech, I will be removing the alternator belt. Clark Last edited by cad; 05-29-2025 at 01:20 PM.