I was working on my 74 260z and I put the battery in. I connected up the passitive and the negitive came in contact with the negitive one. I then hooked up the car and a battery fusible link burnted. what else do I have to check to see if it is ok? What else would be effected by this? The car was in the lock possition and nothing was on in the car.

I actually just had this happen in an Infiniti G20...cooked the fuseable and the radio and the anti-theft and the defroster.

Fortunately, fusables for Zs are a bit cheaper. You can get them from MSA if you need them.

Once you get the car powered again, check all the electrics, lights, wipers, and so on. You might have just taken out the links...which is what they're for.