[Voltage Regulation Issues]

Sorry, the cars a 1978 280z.

[Voltage Regulation Issues]

My voltage gauge bounces between 12 and 16 while idling at startup.   As soon as I give it gas, the voltage spikes to the max reading the gauge will read.  This started happening after I cleaned the fusible links with a brass wire brush without disconnecting the negative battery cable.  A spark shot from the link terminal through the wire brush into the bracket that holds the fusible links.  I thought it was the voltage regulator that was fried in the alternator, but after installing a new alternator, the problem persists.