You need to have a good tight connection there. If it takes a new end on the cable...so be it.
After that put some grease on the top,bottom and sides of the treminal to seal out moisture.
218,000miles 5/2012 ej257 short block, 8/2011 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
Engine Build - Click Here