I've replaced both the ground and hot cables on both of my trucks a couple of times and have had nothing but trouble. As of late the the ground cables seem to be too big for the posts on my battery (have to tighten them down all the way to stay snug.) The hot cables don't seem to be big enough, I can tighten them down just a few turns, and the connectors at the battery will crack!!

Do they make different sizes of posts on top post batteries? Or are the cables i've bought just junk?

 

The positive and negative battery posts have always been different sizes. I forget which one is the larger one.
Most cable clamps are made with enough "give" so they'll fit either post.

 

The positive post is always larger than the negative post.

Get them snug, that's all. Sounds like you applied too much torque if the connectors cracked.

 

Probably should've worded my question better.....I know the positive is bigger than the negative. What i'm wondering is when I buy a positive cable for instance, do they make different sizes in the connector? The positive cable I bought seemed way too small for the post on the battery, hence the reason it cracked. Only gave the nut a couple of turns of the wrench before it happened.

 

They may...but post terminals are pretty much universal.

Sounds like you bought a generic negative post cable which are not marked. You get what you pay for.