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Just been having a look on the Talk Audio forum & they highly recomend upgrading the wiries that go from the Alternator to the battary, the Battery tot he body & the engine to the body

so i'm gunna have a go at this, but i don't really know where to start ie does the wire from the alternator just go stright to the pos terminal & what size cable should i use ? 8awg, or 4 awg

also the engine to chassis connetion, i though this was normaly a earth strap ? if so do i replace the earth strap with an earth strap or do i use normal cable again what thickness

& the thickness of cable for the batt - to the chassis is pretty obvious, take it it will be the same size as the alternator wire
 

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have a look what size wire you got at the moment and go the next size up as for the earth stap leave it as a earth stap as it has a bit more play in it but find a bigger one.
 

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The alterantor is wired to the Starter motor, then the Starter motor is wired to the battery.

The Starter wiring is obviously thicker than the alternator wiring.
 
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