Vortec’s have the frame to firewall and frame to passenger side head(among others). I’m not aware of a ground on drivers side head.It is the battery to the frame, the frame to the alternator, (usually 2 seperate 4 gauge wires bolted to the frame.
Then a SINGLE ground strap from one or both heads to the FIREWALL. Not the frame... or the starter... Usually is the key word.
Your ECM gets grounded directly next to the passenger head, but I usually attach a long passenger firewall strap directly to the stud holding the COIL to the manifold. It is long enough and it is easier than fiddling with a 3/8"tiny bolt behind the head on the passenger side.
The driver's side head sucks bolting the strap too.
2 head grounds, (or one to the coil), is better than one.
The wire you have is the passenger side or the driver's side head to FIREWALL ground wire.
They are $10 each from AZ or Sum.
Buy 2 and fix all your grounds or you'll screw up the ignition module or cause the ECU to stop working.
Nobody here is stoopid. Trucks are stoopid.
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Left strap to firewall/Right strap to head.