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.
193k, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. CHECK your oil, these cars use it.
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