it is always better to have a ground from the battery to the chassis. I have 4awg cable ground negative battery terminal to chassis. Then i always have to rear batteries to stop voltage drop along the power cables. I run a 4awg from my amp straight to the battery. which then also has another 4awg run to the chassis. Make sure u use good size cable usually same size as ur power cable.
MAKE SURE U SAND AWAY THE PAINT TO BARE METAL AND GROUND FROM THERE.
Also what amp are u using. If its Jaycar Response u aint going to get rid of that whistle. The other options is trying different RCAs.
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