89 Supra Turbo w/1JZ Swap Problems

[Donnies Foreign Car]

Need some help from others that might have experienced this problem. The car is a 1989 USA Spec Toyota Supra Turbo. The new engine is a JDM 1JZ swap. The problem is with the headlights, marker lights with the car running. With the car off you can turn on the headlights and everything works exactly right. If you start the engine and the voltage stays at normal at around 14.4 or so then the headlights, marker lights, tail lights all work okay, but if the voltage drops, the headlights start going up and down and the headlights flash along with all the other lights. The alt as been checked out and it is good. The voltage regulator is also good. Please if anyone can help this would be great. Thanks Jeff

[Getphazed]

if the headlights are flipping up and down and light flashing its possable could be the factory alarm