Its looking like I need to replace starter & alternator cables as they are seriously corroded. To avoid splashing out on fresh cable (and in the spirit of reclaimation ) is there any reason why I can't use a spare set of 4m jump leads I have. The cable is thicker and its 500 amps but would it be ok?!!
I very much doubt your jumpleads are as thick as the standard dg starter cable which is 35mm2
its not about amps its voltdrop thats the issue and insulation thickness to be safe
Just run it doubled! 1000 A is more than enough. (so long as it is fine stranded flexible cable and not that thick stiff strand stuff that is quite often aluminium)