Alternator surging

Also the stock alt pulley is in the 2.5" diameter, rebuilds tend to u hise closer to 3 or larger.

The alt needs to spin (it's shaft speed) around 2000 to 3000 rpm 6.5 crank to 2.5 alt

700 engine RPM x 2.6 (6.5/2.5) = 1820, that is the low-end of good charging alt RPM.

700 engine RPM x 2.2 (6.5/3) = 1516, that is below the good charging alt RPM.

My 67, just started and got it off fast idle my pulley is closer to 2.5", I have a grounded field round back, and an electronic version of the electro mechanical VR.

New video by Dana Nance