Originally posted by Stazi:
Replace them all - not too bad a job. But make sure you SOLDER the new wires together not those POS crimpers! 
That's my plan for sometime in the future and perhaps the battery may end up in the trunk if I get motivated enough. I still have an issue with dimming lights at idle despite a new battery and my alt in good order. It's been like that since prob about 50,000kms so I'm hoping replacing the wiring will help. If not I know my battery cables are all in good shape.
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