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Troubleshooting Instructions for Latching Relay


If you're having problems getting your system to work, please follow the instructions here.

Circuit Inspection

  1. First, make sure your Latching Relay is wired like one of the schematics in the installation instructions section. The "G" terminal should be connected to ground, the "+12" terminal to a positive 12-volt supply, one or both of the the trigger inputs ("1" and "2") should be connected to some type of trigger signal that either connects to +12V or Ground when the LR should be on, and finally, the "L" terminal should connect to the ballast's (or other device's) negative lead (for negative-switching LR-N version), or positive lead (for positive-switching LR-P version). The ballast's positive lead should be connected to the 12-volt supply.

  2. For safety, also make sure you have installed appropriate fuses, so that if either the ballast or the LR fail and draw too much current, a fuse will blow rather than a fire starting.

Testing the Ballast or Other Device

  1. LR-N negative-switching version: If the device does not seem to be turning on, disconnect the wire from the "L" terminal, and touch it to ground. If the device still does not turn on, use a voltmeter and check that the device's positive lead is getting battery voltage. If so, then there is something wrong with the device.
  2. LR-N negative-switching version: If the device comes on immediately on power-on, and never turns off, disconnect the wire from the "L" terminal. If the device continues to operate, there is something wrong with the wiring, and the device's negative lead is connected to ground. The negative lead should only be connected to the LR-N's "L" terminal, and nothing else. The LR-N will turn the device on by connecting the "L" terminal to ground internally.

  3. LR-P positive-switching version: If the device does not seem to be turning on, disconnect the wire from the "L" terminal, and touch it to +12V. If the device still does not turn on, check that the device's negative lead is properly connected to ground.

Testing the Latching Relay

  1. If the LR does not seem to turn on, flip the small switch on the LR's backside. The LR looks for positive (12V) trigger signals when the switch is in the "off" position (with the white tab closer to the terminals), and it looks for negative (ground) trigger signals when in the "on" position. If the trigger signal doesn't match the switch, the LR simply doesn't turn on. You can also use a voltmeter to positively verify your trigger signal is 12V or ground when active, and match it to the switch position.