§ 04 · Wiring & Power
Atlas Electrical
The Astro & Safari wiring reference — factory circuits, aux power, dual battery, and solar, filtered to your rig's year and system.
Wiring colors, pinouts and fuse values vary by year, trim, drivetrain and market (Canada DRL, export). Always verify against a factory Service Manual for your exact VIN before cutting, splicing or fusing.
Systems
Reference
Factory Service Manual index
Section 8 of the GM Service Manual is the authoritative source for chassis wiring, connector views and pinouts. Cross-reference by year and drivetrain.
- Gen 1 (1985–1994)
- GM M-body Service Manual, Section 8A–8D
- Gen 2 (1995–2005)
- GM M-body Service Manual, Section 8A + Body/Chassis Wiring
- AWD-specific
- Add-on TCase & VCU circuits — Section 7B for NP136
Reference
Field wire-sizing quick reference
Copper conductor sizing for 12 VDC runs, at 3% max voltage drop, round-trip length. Round up when in doubt.
- 10 A · 3 m
- 14 AWG
- 20 A · 3 m
- 12 AWG
- 30 A · 3 m
- 10 AWG
- 50 A · 3 m
- 8 AWG
- 100 A · 2 m
- 4 AWG
- 200 A · 1 m
- 2/0 AWG