i always have trouble crimping terminals on 0-4 awg...between hammers, vise grips, vice's...i can never really get them to stay on good...anyone got a good trick?? maybe a torch and a @!#$laod of solder will solve it?
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I used a vice for my 2 guage. worked wonderfully.
 
 
vice works good. They also make a little tool that you can stick the connector into and hit the thing with a hammer and it crimps it.
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find non-crimp connectors.  it gives a LOT neater appearance.
Desert Tuners  

“When you come across a big kettle of crazy, it’s best not to stir it.”
 
They do make crimpers for those type of connections.....they are expensive.  I like to use a vise.
Sam
Ban low-performance cars, not high-performance ones.
 
Vice... then I take a pick and put it in the center of the connector, and hammer it so it makes a nice dimple. That way the wire doesn't pull out easily.
 
 
I use a vice and then take heat shrink tubing to clean up the look a little.
 
I just drop the mushroom tattoo on it, works perfect.
 
 
Vice...then hammer...then shrink tube. 
 
5pointO
 
 
I use the connectors with the screw in them, works very well.
 
 
you could always solder the crap out of it and not even have to crimp it
 
 
I usually try to bend 1 side at a time. that way it will bite into the wire and get a decent grip then just bend the other side over.

2009 Ford Mustang V6
 
torch, solder, heat shrink. use the type with a rosin core as it will clean the copper as it melts.  heat shrink will clean up the melted insulation and black on the outside of the connector.   
14.82 @ 97 mph