It would be a good idea to take a bit of sand paper and clean up all of your grounds. There is the large cable that goes to the block, on the fire wall on the passenger side coming off the back of the head, one the drivers side on the head I think. I also put a little copper coat under the terminal. I would also go to youtube and see how to do a voltage drop test. You can use it to find out if your cables are bad. If you just do the terminals and not the cables this should be considered a temporary fix. I would consider replacing the cables oem would be best if budget allows.
