Understanding the 4-Wire GPS Harness Color Codes
Installing a professional vehicle tracker like the Alike GPS VT05R is straightforward once you understand the standardized 4-wire automotive harness color codes:
| Wire Color | Signal Name | Connection Point on Bike | Function |
|---|---|---|---|
| RED | Constant +12V Power | Direct to Battery (+) terminal via 2A inline fuse | Continuous power for tracking & cellular modem |
| BLACK | Chassis Ground | Direct to Battery (-) terminal or bare chassis bolt | Electrical ground return path |
| ORANGE / GREEN | ACC / Ignition Sensing | Switched ignition live line (12V only when key is ON) | Detects engine running vs parked deep-sleep state |
| YELLOW | Relay Control (Ground Trigger) | Connects to Pin 86 on the 4-pin relay harness | Triggers remote engine cut-off on user command |
How to Wire the Engine Cut-Off Relay (Step-by-Step)
The remote immobilization relay is an electrically operated switch. When you tap 'Engine Cut' in your mobile app, the yellow wire grounds the relay coil, breaking the motorcycle's starter or fuel pump circuit.
- Locate the positive wire going to your motorcycle's starter relay or fuel pump circuit.
- Snip this single wire. You now have two cut ends: Side A (coming from the ignition switch) and Side B (going to the engine/pump).
- Connect Relay Pin 30 (thick green wire) to Side A.
- Connect Relay Pin 87a (thick green wire) to Side B.
- Connect Relay Pin 85 (thin white wire) to switched ignition +12V power.
- Connect Relay Pin 86 (thin yellow wire) to the tracker's YELLOW output lead.
💡 Safety Circuit Protection:
Pin 87a is 'Normally Closed'. If the tracker ever loses power or is completely removed, the relay remains closed, meaning your bike will continue running normally and never strand you on the road.
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Frequently Asked Questions
What tools do I need to fit a GPS tracker in my bike?
You need a basic 8mm/10mm spanner, wire stripper, digital multimeter (or 12V test bulb), black heat-shrink tubing or insulation tape, and nylon zip ties.
Do I have to connect the yellow engine cut wire if I only want tracking?
No! If you only want live location tracking and geofencing without engine cut-off, you only need to connect 3 wires: Red, Black, and Orange (ACC). Insulate the yellow wire with electrical tape.