What I know is that computerized vehicles are already installed with multiple ground connections.

Yung old van ko di lang multiple grounds ang nilagay. I also installed that huge battery relay (from battery to fuse box with 8G auto wire). The relay is activated by ignition swiitch.

So my fuse box has two power lines:

1. From ignition switch
2. From battery via the relay.

I made it because my fuses were melting and my ignition switch becomes hot when I turn-on the AC. I also replaced the fuse box with heavy duty surplus which luckily has heavy duty fuses installed (HD fuse is expensive more than P75.00 ea).

We retained the old connection to the ignition switch as a security in case the battery relay breaks down.