Arcturus;
"Spiking" is just a general term for electrical noise which might/is likely to be, caused by the contacts of VReg opening or closing (Gen Filed winding has high inductance, so making or braking current through it will cause big spikes on the entire vehicle elec bus!), or the brush-noise on Gen output...if Ign dropouts occur concurrent with VReg contact action, or due to brush-noise, then Ign electronics may be underfiltered, too sensitive, and indeed have trouble functioning reliably...if symptoms persist, I suggest installing some filter caps on Gen Field and D+ output terminals...let's see what happens when you get Ign unit back...
Cheers
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