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Intermittent Voltage Spike problem

1847 Views 5 Replies 2 Participants Last post by  MALIBRU, 
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I'm expierenceing a intermittent voltage spike problem according to my voltage gauge. I have converted over to a "CS" style alternator on my 66 chevelle. Theres nothing in paticular that causes it to do it. I could drive for 30 minutes and have 14 volts and then slow down to stop and it will spike back and forth, burying the needle. Driving to work this morning it did it for about 3 miles, sometimes staying pinned for 30 seconds are so. Ive replaced the voltage regulator and battery and still expierencing the same problem. Any suggestions?
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MALIBRU said:
My volt gauge used to flutter. Until I tightened the gauge ground tight.
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I wish this where the case, the lights get brighter and the fuel pump gets louder indicating a true increase in voltage, not just a incorrect gauge.
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MALIBRU said:
I have a CS-144. Bought a new forward harness from M&H with the conversion built in. The alternator connector has just the brown wire (idiot light). I have a big fused 1-foot cable from the alt to the battery. No remote sensing wire since the battery is right there - no horn relay distribution bus like OEM.

Are you saying you replaced the alternator's 'internal' voltage regulator?
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For starters I've had your typical internally regulated 63 amp altenator on the car for years. Did the conversion wiring as shown on team chevelle. Put a big block in the car and ended up with a smaller bodied "CS" style altenator, mine is 85Amps. Bought a new regulator plug to match the altenator and spliced in accordingly. I didnt exactly change just the regulator. I took the back half off a reman alternator and swapped it with my back half. Which includes the regulator plus other things.
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