Power Supply 12V+ ──────┬──► EDC15P+ Pin 2 (+12V / KL30)
├──► EDC15P+ Pin 37 (+12V / KL15 ignition)
└──► Galletto OBD Pin 16
Power Supply GND ──────┬──► EDC15P+ Pin 4 (Ground)
├──► EDC15P+ Pin 5 (Ground)
└──► Galletto OBD Pin 4 & 5
Galletto OBD Pin 7 ────────► EDC15P+ Pin 16 (K-Line)