I'm having issues with my dd 89 mj that I recently upgraded to a 95 xj driveline ( 4.0 aw4 np242 ). Even before I did the swap it read low 13's in voltage with no headlights or a/c on . If I put the a/c on, or the headlights , or the electric cooling fan comes on it dives into the high 11's or low 12's . I also confirmed the guage was correct with a charging system tester at orielys .When I did the swap I refreshed / added new
grounds where needed . It's a new alternator and I know the voltage is controlled by the computer in that year . Any other things I should do to try to fix this issue? I want to wire up some lights but want to address this issue first . As always any and all help is much appreciated . Thanks