Azuga 3 Wire Extension Cable with Diode, 900 mm

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At a glance

What it is

This is the 3 wire hardwire extension cable with a diode, 900 mm long, about 3 feet. The shop says the diode protects against reverse polarity. Red is constant 12 V, white is ignition 12 V that is on when the ignition is on, and black is ground. The price was $9.99 and the stock showed available on 2026-10-21.

The three wires, and what each should read

These readings come from Azuga's 3 wire guide. Meter the circuits before you connect the extension and again at the tracker end after. A circuit you have not measured is a guess.

Why the white wire causes the most trouble

Constant power and ground are easy to get right, because they are always there. The ignition circuit is the one that has to switch, and the wrong tap looks fine until you test it. A tap that stays live after the key is off tells the tracker the engine is running when it is not. Azuga does not state this, and it is general field experience of what goes wrong. The cure is the same every time. Meter it with the key on and off.

About the diode

A diode lets current flow one way. The shop says this one guards against reverse polarity, which is what you get if power and ground are swapped. Azuga does not say where the diode sits in the cable or which wire it covers. As a general matter, a diode in a power line drops a little voltage, so we meter the red wire at the tracker end and not only at the source.

The light check

1. Power up. Azuga says all the lights blink once.
2. A solid green light for about 5 seconds means success.
3. Red blinking every 2 seconds means the install failed. Repeat the install.

Azuga documents no other states in the guide we read. ServiceTitan's Fleet Pro version says the green light flashes for five seconds, so the wording differs and we have not verified which is literal.

What is not verified

• Where the diode sits in the cable.
• The wire gauge and any fuse on the red wire.
• The connectors at each end of the cable.

Where to go next

Questions we get

Do I need this instead of the 2 wire cable?

Match the cable to the tracker. The 3 wire tracker also reads ignition, so it needs the cable with three wires. The 2 wire extension carries only red and black.

Is the diode a problem on a 24 volt system?

Azuga limits its hardwired trackers to sources no higher than 24 volts DC and does not rate this cable. We confirm with Azuga for a 24 volt install.

What if my meter shows 12 volts on the white wire with the key off?

That circuit is not switched. Move the tap to one that is only live with the ignition on, then test again.

Sources: Azuga shop product page, checked 2026-10-21, Azuga 3 wire install guide, Azuga blog on hardwired trackers. AZUGA is a trademark of its owner. API Signal is an independent installer and is not Azuga.