I found this info in the Atari Jaguar FAQ , created by Robert Jung.
24-pin male 0.1"-spaced dual-sided card edge connector at the console.

| 1 | Right Audio | 2 | Left Audio | |||
| 3 | GND (Audio) | 4 | GND (Audio) | |||
| 5 | 6 | |||||
| 7 | Red | 8 | GND (Chroma) | |||
| 9 | Composite Sync | 10 | Blue | |||
| 11 | 12 | Horizontal Sync | ||||
| 13 | GND (Luma) | 14 | Green | |||
| 15 | Luma | 16 | Chroma | |||
| 17 | 18 | |||||
| 19 | GND (Composite Video) | 20 | ||||
| 21 | Composite Video | 22 | +10V power supply | |||
| 23 | 24 |
Jay Tilton
06/28/98