How-to-guides - Relay applications continued

Saving the day with relays

Here are more relay circuit designs to solve many obstacles you may encounter when installing, remote security, remote entry, and more!

Flashing Lights and Dome Light Supervision from Flashing Light output with (-) Door Trigger)

The diagram below shows how to use a couple of Single Pole Double Throw (SPDT) relays to add Dome light Supervision and Flashing Light output to the Flashing Light output (White Wire) of an alarm, on a vehicle with (-) Negative Door Triggers. Example:

This relay configuration can be used to add Dome light Supervision to an alarm which does not offer the feature. 

When adding Dome light Supervision to the Flashing Light output of an alarm, the interior light flashes the same as the parking lights in the vehicle, therefore, staying on for 60 or 30 seconds after remote disarm.

Flashing Lights and Dome Light Supervision from Flashing Light output with (+) Door Trigger

The diagram above shows how to use a couple of Single Pole Double Throw (SPDT) relays to add Dome light Supervision and Flashing Light output to the Flashing

Light output (White Wire) of an alarm, on a vehicle with (+) Positive Door Triggers. 

Example:

This relay configuration can be used to add Dome light Supervision to an alarm which does not offer the feature.

When adding Dome light Supervision to the Flashing Light output of an alarm the interior light flashes the same as the Parking lights in the vehicle, therefore, staying on for 60 or 30 seconds after remote disarm.

Latching Relay (-) Negative trigger

The diagram above shows how to change a single (-) Negative Pulse to a constant chassis ground output using one Single Pole Double Throw (SPDT) relay and a 1 or 2 amp Diode.

Example:

This relay configuration can be used to change a single (-) pulse to a constant ground for use with window roll-ups, extra lighting, radio accessories or any other circuit which requires a constant ground instead of one single (-) Negative pulse.

Warning: Once the relay is latched it will stay latched until it is reset by opening the constant 12 volt circuit to pin #86.

The Constant 12 volt input to pin #86 can be “opened” or interrupted using a momentary contact switch, or relay can be added to the 12 volt input to pin#86 and configured as a normally closed circuit so that, when the relay energizes, it will interrupt the 12 volt input and unlatch the “Latching Relay”.

Latching Relay (+) Positive Trigger

The diagram above shows how to change a single (+) Positive Pulse to a constant 12 volt output using one Single Pole Double Throw (SPDT) relay and a 1 or 2 amp Diode.

Example:

This relay configuration can be used to change a single (t) pulse to a constant 12 volt  for use with circuits such as extra lighting, radio accessory circuits, or any other circuit which requires a constant 12 volt output instead of one single (+) Positive pulse.

Caution: Once the relay is latched it will stay latched until it is reset by opening the ground circuit to pin #86.

The ground input to pin #86 can be “opened” or interrupted using a momentary contact switch, or a relay can be added to the ground input to pin #86 and configured as a normally closed circuit so that, when the relay energizes, it will interrupt the ground input and unlatch the “Latching Relay”.

Disclaimer

Mobile Information Labs assumes no responsibility with regards to the accuracy or currency of this information.  Proper installation in every case is and remains the responsibility of the installer. MIL, assumes no liability or responsibility resulting from an improper installation, even in reliance upon this information.