I just installed a new alternator but now my rpm guage wants to flucate randomly. Sometimes its fine..other times it drops to zero then pops back up. Had the battery andalternator checked out..they were both ok. Checked the belt routing..it looks right. Any ideas?

 

www.atlanticbritish.com tech tips for belt routing.

 

Sounds like a loose wire on the back of the alternator.

 

Thanks...that what I was hoping. I'll go give it a check after it stops raining.