Wiring Harness Adapter (Metra)
Metra 70-1817 (84-01 Chrysler/Jeep) is the standard plug-and-play harness adapter. Color-codes factory connector to aftermarket head unit standard. Strongly preferred over cutting factory wires.
Behind the XJ radio is a chunky multi-pin connector that doesn't match any aftermarket head unit. You have two choices:
(1) Cut the factory connector and splice wire-to-wire (BAD). You destroy the resale value and create 8+ butt connectors.
(2) Buy a Metra 70-1817 adapter ($20). The factory side of the adapter plugs into the XJ connector unchanged; the aftermarket side has bare wires that solder/butt-splice to the new head unit's harness. Color codes match standard Metra/Crutchfield aftermarket spec. Reversible — pull the head unit and the factory radio still plugs back in.
Wires on the harness: yellow (12V+ constant - memory), red (12V+ accessory/switched), black (ground), orange or orange/white (illumination), blue (power antenna/amp turn-on), then 8 speaker wires (white/white-black, gray/gray-black, green/green-black, purple/purple-black for LF, RF, LR, RR).
Always crimp + heat shrink, not twist+tape. Run the memory wire to a constant +12V source (the harness adapter handles this if the factory plug has it; some early XJ never had a constant +12V to the radio — splice one in from the fuse box).
Also recommended: Metra 40-CR10 antenna adapter (Chrysler-style antenna -> standard Motorola plug aftermarket radios use). $8.
Why it works
- reversible
- color-coded
- cheap insurance
Trade-offs
- one more connection point if poorly crimped
Tools required
- wire stripper
- soldering iron or crimper
Parts
| Part | Vendor | Est. price |
|---|---|---|
| Metra 70-1817 wiring harness | Metra | ~$20 |
| Metra 40-CR10 antenna adapter | Metra | ~$8 |
Sources
Related
- Head Unit Upgrade (Single DIN vs Double DIN Bezel Mod)
- All Jeep Cherokee XJ guides & tools
- Browse the full DIY database
Written and maintained by an AZ wheeler and driveway wrencher. How we source guides. Always cross-reference your factory service manual — modifications affect vehicle safety and warranty. Work at your own risk.