Fuse, Splice, RouteThe part of the job the customer never sees and always pays for

Built by Installers, for Installers

You have found a constant, an ignition and a ground, and you have tested all three. Now you have to connect them in a way that survives potholes, heat cycles and a customer who will never look behind the dash. This lesson is about three habits that separate a clean install from a ticking one: fuse what you add, make connections that hold, and put the wire where nothing can grab it.

Fuse what you add

A fuse protects the wire, not the device. If a wire you added shorts to metal, the only thing that stops it from heating up is a fuse, so every power feed you add needs one, close to where it taps in. An add-a-circuit fuse tap is a common way to do it: the factory fuse stays in its slot, the tap gives you a second fused output, and you do not cut any factory wire.

• Test the slot first. It must be live with the key out if you want constant power, and the lesson 1 test tells you.
• Size the new fuse to the device and the wire. The device's installation guide gives the rating, so follow it.
• Do not tap a safety circuit. Airbag, brakes and anything critical to driving are not where a tracker lives.
• Never pick a wire by color alone. Test it.

Splices that survive the road

A vehicle is a shaker table with a heater. Everything behind the dash moves, warms up and cools down every day. A twisted and taped splice looks fine for a while, then it loosens, corrodes or leaves bare copper next to metal. A crimped splice made with the right tool, tugged hard to prove it, and covered with adhesive heat shrink holds for years.

1. Strip only what the connector needs.
2. Crimp with a proper crimp tool, not pliers.
3. Tug each wire to prove it holds.
4. Insulate every splice with heat shrink or the connector's own insulation.

Route it where nothing can grab it

Wire routing is where installs turn dangerous. A loose wire near the steering column can wrap around it. A loose wire near the pedals can catch a foot. Keep everything clear of both, follow factory harnesses where you can, and secure the run with ties so it cannot sag into a moving part.

Think about the device too. GPS and cellular antennas need a clear view, so mount the device where metal does not sit over it, up high in the dash is a common spot, and keep it away from big metal brackets. A great wiring job on a poorly placed device still fails on signal.

Your turn

Quick answers

Do I need a fuse on a tracker power wire?

Yes. Any power wire you add should have a fuse close to where it connects, sized to the device and wire per the installation guide. The fuse protects the wire.

What is the best splice for a vehicle install?

A crimp splice made with a proper crimp tool, tugged to prove it, and covered with heat shrink or the connector's own insulation.

Where should I route tracker wires?

Away from the steering column and pedals, following factory harnesses where possible and secured with ties so nothing can sag into a moving part.

Built by Installers, for Installers.
Constant. Ignition. Ground. API Signal.