i ground mine to the rear support and wired in a cut off at the same time but as for the window ground my stereo cuts out when the window is half up.
as for the strap there its woven wire and there notorice for bad conductivity its not really a positive ground just a discharge ground
like replacing a engine stap that glows red with 4 gauge wire and it stops
hope the car works out for you.
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89 with 331 t3'/t4 hybrids. upr Suspention worked out finnaly . 9.89 144 mph .
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