1993 Other Ford Models Warning lights on while driving

Hi
Couple of issues with my car
1) My dashboard is showing warning lights for handbrake, battery and rear light, ABS warning light. Even when they are not supposed to i.E, while handbrake is down and leg brake is not pressed, battery is fully charged. I just got my car from service and tune and the mechanic couldn't figure out why is that happening and still investigating. It doesn't happen all the time but happens almost 90% of the time while driving.

2) My car used to vibrate while driving uphill and used to go off with slight change in throttle on accelerator. When I took my car to a mechanic he said engine mount could be issue and he replaced it. Still never solved the problem. Today when I took to another mechanic, he said ignition leads are to be replaced and that could be and issue. He replaced it and when I did a test drive, I didn't notice in 30 minutes of driving at various altitudes. Not sure if the problem is indeed fixed or just didn't appeared that time but what I was wondering is how ignition system causes car to vibrate on going uphill. Was wondering have I been ripped off. It costed $169 to fix :-(.