[steelrat]

took my altenator out to replace a bearing, fixed it and put altenator back in. At idle to 2000 rpm the gauge reads 14. Rev it past 2000 rpm and the needle snaps to zero and stays there.

Gauge?
Wiring?

 

[Custom Jim]

Gauge?
Wiring?

I would say either or both.

Double check your connections on the alternator and the gauge.

I would use a meter to check things or a test light. You should be able to find the problem with either of these tools.

Jim

 

[steelrat]

loose wire at gauge