Upgrade your old and crusty MK4 ground cable.
I make this ground cable using 1/0 gauge copper cable battery to body to transmissions. Solid copper ends are soldered and “HEX” crimped for the best connection, then adhesive lined shrink tubing is installed for protection.
Battery terminal to body is 19″ long, body to transmission is 21″ long.
Volkswagen MK4 ground cable : $75.00