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ahh right sorry.. Yeah 0 gauge is the best stuff and a power cap also.

My mate hada 1.5 power cap with his audiobahn gear and it was still making the lights dim

Update Just read the above guide.

Never knew that,
 
thanks for the answers guys.

ref power caps everything ive read seems to be a 'no' about them so will try thicker wires and the big 3 for now.

my main power is 2 gauge, my amp earth is 1 foot of 4 gauge, the batt -ve to chassis appeeeears to be 4 gauge, it actually looks quite thin compared to my power (see crap pic)

i wanna do engine-chassis earth and alt-batt positive, but i dont know where they are physically. hopefully my incoming fabia haynes manual will give me an idea...

my engine off=12.2v
engine idling=14.4v
engine on with air con+lights going is 12.7v (which is quite low?)

battneg.jpg