12V Car Battery Checker | LED Relay Tester & Auto Accessory

LED Indicator Light Car Battery Checker – Automotive Relay Tester

Feature	Details
Brand	CNBJ-707
Power Source	12V Car Battery (11V-15V)
LED Indicator	Green (Pass) / Red (Fail)
Relay Compatibility	4-Pin & 5-Pin Automotive Relays
Testing Functions	Pin Configuration, Contact Closure Timing, Relay Consistency

Quick and Reliable Relay Testing

The CNBJ-707 relay tester does its job without fuss. Hook it up to a 12V car battery, connect a relay, and press the button. It scans the pin layout, checks the time it takes for contacts to close and open, and repeats the process ten times for consistency. If the relay works as it should, the green LED lights up. If it fails any step, the red LED calls it out. There's no need to guess. No time wasted. Just a simple, clear result that tells you if the relay stays or goes.

Easy Setup with Clear Indicators

Hooking it up is straightforward. Black alligator clip to the negative battery terminal, red to positive. Once powered, the red LED confirms the tester is ready. Before inserting the relay, select 4-pin or 5-pin mode. If the relay pin configuration is off, the red LED warns you immediately. The test runs automatically. The relay opens and closes ten times, checking for delays or failures. If it performs within the expected range, the green LED signals a pass. If something’s off—delays, inconsistency, or a bad pin—the red LED shows the problem.

Works with Most Common Relays

The CNBJ-707 handles standard automotive relays. It supports 4-pin and 5-pin configurations and works with relays that have a coil resistance above 20 ohms. Whether diagnosing a failing relay or confirming a new one is good to go, this tool gives a quick answer. It’s compact, lightweight, and doesn’t take up space. Toss it in a toolbox, keep it in a glove compartment, or store it in the garage. Whenever there’s a doubt about a relay, this tester sorts it out in seconds.

Durable and Battery-Friendly

Powered by a standard 12V car battery, the tester operates between 11V and 15V. It doesn’t drain power or overcomplicate things. The LED indicators stay bright, and the internal components hold up to repeated use. This is a tool built to last, with no unnecessary features or fragile parts. No complicated manuals. No wasted time. Just a simple tester that does what it’s supposed to do, every time.

Frequently Asked Questions

• What type of relays can this tester check? – It supports standard 4-pin and 5-pin automotive relays with a coil resistance above 20 ohms.
• How do I connect the tester? – Attach the black clip to the negative battery terminal and the red clip to the positive terminal.
• What does the red LED mean? – It signals a failed test due to incorrect pin configuration, timing issues, or relay inconsistency.
• Can I use this with any car battery? – Yes, as long as the battery voltage is between 11V and 15V.
• Is it difficult to use? – No, just plug in the relay, select the correct pin mode, and press the test button.