Very Strange Issue...... Slight sputtering when head lights are on?????

[JJs 88 Wrangler]

I have a 88 Wrangler 4.2L. Over that past winter and spring, I put a new engine in my Jeep. Everything is running pretty good until I turn the lights on. I get a slight sputter while driving, and while idleing. Any ideas??? The rebuilt carb that I have on her is from prior to the rebuild, New distributor, fuel pump, egr valve. I was told to have her run rich until the engine breaks in. She only has about 750 miles on her now. If I try to lean her out a bit, she sputters a lot. I wiggled all the harnesses, put a wire from the Neg. on Battery to the body, with no sucess. I started to do some troubleshooting, it seems only to sputter when the head lights are on, Not the parking lights. I didn't feel anything wires or switches getting warm, nor did I see any overheated wires.

Please Help....... Thank you in advance for any input to my issue.......

 

[ka041a]

are the headlights flickering and is the ammeter fluctuating? the delcotron alternator,if that's what you have on your vehicle, depends on SENSING VOLTAGE and any kind of a short anywhere on the system can lower the system voltage which results in the alternator maintaining voltage at about 1 volt above what it senses, which might result in the ignition system not getting enough steady voltage to run properly. just one possibility- john

 

[JJs 88 Wrangler]

All fixed... It turns out that the alternator had a short in it. Figures, the only part I did not change during the rebiuld. Thank You all for your input...