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Battery earth cable to chassis/starter/gearbox housing

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I am in need (once again!) of your counsel - I am intending to replace the earths from the battery to the chassis and gearbox housing and add an earth from battery direct to the starter motor. This should cure the intermitent starting issues - its definately an earth issue as connecting battery negative to engine block with jump leads cures the problem.

Anyway - the plan is to use the starter cable provided by those nice chaps at VWP

16mm2 cable from battery -ve to starter earth

16mm2 cable from battery -ve to gearbox housing

16mm2 cable from gearbox housing to chassis

So will the 16mm2 (110 amps; outside diameter 7.5 mm incl insulation) cable be sufficient given that the orginal battery earth lead is 40 mm2 (outside diam 11.8mm)

Thanks v much

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