5.7 Mercruiser won't start

[dbullen]

I left the lights on the boat and both batteries drained. I took my car battery and hooked it up to one of the batterys on the boat with jumper cables, when I turned the ignition over it started to crank and then just cut out completly even though the key was turned over. Now when I goto start it (with the boat batteries now charged) it just cranks and won't start, it was working fine before I let the batteries die. Is there any fuses I can look for or anything I can test with a volt meter, (I know very little about boats) just got this one. I'm guessing I either blew a fuse or caused some type of electrical problem when I tried to jumper it with my car battery. But I have no idea where to look for fuses other then the panel by the steering wheel and all fuses are fine there.