Last couple of days my GT has been kinda hard to start. The starter sounds the same as usual, but the engine turns over longer before it will fire. A couple of times I have had to crank it twice to get the engine started. I always let the fuel pump prime before I try to crank the engine before anyone suggest that. I believe this all started about a week ago after trying to jump start my '93 4 popper coupe I just bought as a beater. I am wondering if I damaged my battery. The beater didn't have a battery on it when I bought it and I just ran jumper cables from my car to the other cars battery cables so I could pull codes on the 2.3. I also cranked the engine over a few times on the 2.3 with the cables hooked up like that to make sure the engine wasn't locked up. The battery on my car is just some no-name cheap battery it was on there when I bought it 2 1/2 years ago. I was wondering if I could use my multi-meter across the battery terminals with the engine running to see if it was bad, and if so what voltage should I see?