1994 Oldsmobile Achieva 1994 Olsmobila Achieva S low voltag

I want to thank you for responding. I haven't checked the spark yet with starter fluid. It reads 8-11 on the inside gauge. My battery was tested as good, where the loaner they gave was bad(checking to see if it was the battery). I am a female who is pretty good on fixing things and I am tired of going to my local service and being charged $500.00 every time I walk in the door. Since changing the fuel filter it seems less able to turn over. I am going to put it back on the charger until I try starting again. A general idea would give me a starting point. I have to share this story. A 27 yr old saw me at the auto parts store stuggling to fix my car and came to my house to try to find what was wrong. His time ran out and had to leave. But he gave his very best. Thank you Simon.I appreciated all you tried to do. He did not smell gas which he said I was not getting gas to my engine and that he could only concour it was electrical. I appreciate your response, God Bless and Thank you for all of your help:)