Replace both battery cables.
Clean the body cable ground point when you replace them.
With the load our Diesel starters demand, it is not worth patching cables or replacing cable ends, that adds weak points = resistance points to the cables.
I have seen patched cables melt down and short...
1000+ AMPS on a cheap replacement cable end is begging for starting problems in winter...
__________________
ASE Master Mechanic
asemastermechanic@juno.com
Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer
1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic
https://www.boldegoist.com/