Question about 1989 Jeep Wrangler

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1989 electrical problem

I have a 89 jeep wrangler and I cannot use my headlights, turn signals, and stereo at the same time without my electric going crazy and shutting off my engine.

With only the car on and stereo the electric gauge reads about 14. I turn on the head lights and it goes down to 10-11. When all three are on, it goes down to 8 and under then the car starts to shake and dies. There is a brand new 140 amp powermaster alternator and a new red top optima battery.

Thanks for your help!

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Your starter has a bilt in voltege regulater change your starter selunoyed

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