volt meter bounces

[whiskeyguy]

Help. I just put in a new alternator and battery and my volt meter bounces. Notice it more in the morning when the engine is cold. Short some where? or .... Looking for suggestions.

 

[doc_sun]

Possible ground issue, but it sounds like it's the wrong size alternator. If you have an LT, Denali, etc. it should have a 145 amp. Part stores will tell you that a 105 is a proper fit for any of the vehicles, but they would be wrong depending your vehicle's options. Your RPO code will tell you which size was in there from the factory.

 

[Mr. 960]

probably the case. I know mine has a 160amp stock.

Mr. 960