How Do I Wire the Blink Video Doorbell for Power?

Problem Description

You want to wire the Blink Video Doorbell to your existing doorbell wiring for continuous power instead of using batteries. The existing wiring must provide 16-24V AC. The doorbell connects to two wires behind the mounting plate (no polarity). This guide covers checking voltage, connecting wires, and verifying the wired power is detected in the Blink app.

Why This Happens in Real Homes

Wiring the Blink Video Doorbell gives it continuous power instead of relying on the two AA lithium batteries, but it only works if your existing doorbell wiring actually supplies 16-24V AC. That's the crux: many homes have doorbell transformers, but an undersized or aging one can deliver too little voltage, in which case the doorbell keeps leaning on its batteries and the app won't confirm wired power. Before connecting anything, verify the voltage at the wires is in the 16-24V AC range - if it's low, the fix is upgrading the transformer, not troubleshooting the doorbell.

Mechanically it's simple: the doorbell connects to two wires behind the mounting plate with no polarity to worry about, so just make sure both are securely fastened - a loose wire is a frequent reason wired power isn't detected or the doorbell reboots. Kill the doorbell circuit at the breaker while you work, then restore it. If you want your existing mechanical chime to ring, it needs to be compatible (or configured/bypassed appropriately) with the doorbell's wiring; otherwise you can use the app or an Alexa device as the chime. After wiring, confirm in the Blink app that it recognizes wired power, and update the firmware if it doesn't detect the change.

Symptoms

• Wiring the doorbell for continuous power
• App doesn't detect wired power
• Doorbell still runs on battery after wiring
• Existing chime doesn't ring when wired
• Doorbell offline after wiring
• Voltage uncertain at the wires
• No chime module / incompatible chime
• Doorbell resets or reboots when wired

Recognize these? Here's what usually causes it.

Common Causes

• Existing wiring not supplying 16-24V AC
• Wires not securely connected behind the mounting plate
• Transformer undersized/aging (low voltage)
• Existing mechanical chime incompatible without config
• Breaker/doorbell circuit off
• Wires reversed expectation (no polarity, but loose)
• Batteries still relied on due to low wired voltage
• Firmware not updated to detect wired power

Tools & Requirements

Step-by-Step Solution

1

Check existing doorbell wiring voltage

The Blink Video Doorbell requires 8-24V AC wiring for wired power mode. Use a multimeter to check the voltage at your existing doorbell wires. Set the multimeter to AC voltage, touch the probes to the two doorbell wires. If the reading is between 8-24V AC, the wiring is compatible. Below 8V: the transformer is too weak — you need to replace it. Above 24V: the voltage is too high and could damage the doorbell.

Needed for this step

Klein Tools 80196 Digital Multimeter Kit with C...

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$46.15

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2

Turn off power and disconnect the old doorbell

Turn off the circuit breaker that powers the doorbell transformer. Verify power is off by pressing the old doorbell — no ring means the power is off. Remove the old doorbell from the wall. Disconnect the two wires from the back of the old doorbell. The wires should be sticking out from the wall — do not let them fall back into the wall. Temporarily wrap them around a pencil or tape them to the wall.

3

Connect the Blink doorbell to the wiring

Attach the two existing doorbell wires to the Blink Video Doorbell terminal screws on the back. There is no polarity — either wire can connect to either terminal. Tighten the screws firmly. Mount the doorbell bracket to the wall over the wire hole. Attach the doorbell to the bracket. Turn the breaker back on. The doorbell LED should light up within 30 seconds, confirming wired power.

4

Set up the chime connector (if using a mechanical chime)

If your existing doorbell chime is a mechanical chime (not digital), you need the included chime connector. At the chime box (usually in a hallway): open the cover and attach the chime connector across the Front terminal wires. This prevents electrical interference that causes the Blink doorbell to reboot when the chime activates. Without the connector, pressing the doorbell button can cause the unit to lose power momentarily.

5

Verify wired power status in the app

In the Blink app, go to the doorbell > Settings. The power source should show Wired. In wired mode, the batteries serve as backup power during brief outages — they are not the primary power source. The doorbell draws power from the transformer continuously, keeping the batteries topped off. If the app shows Battery instead of Wired, check the wire connections at both the doorbell terminals and the chime box.

Quick Solutions

Still having issues? This is usually the deeper cause below.

Need More Help? Blink Support

Note: The contact information below connects you directly to Blink's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.

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