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Installation guide P.7

Quenching Diodes

It was said earlier that a relay energizes itself by applying positive from the battery to either 85 or 86 and

grounding the other terminal. This is not absolutely true, some relays are “polarized” if they have a quenching/

suppression diode (A diode installed between the coil terminals 85 and 86, could be internal or external).

To activate the coil on this type of relay, make sure that the +12 volts trigger is on the same terminal of the

relay as the anode (+ or non striped side) side of the quenching/suppression diode, and that the negative

trigger is on the same terminal of the relay as the cathode (- or striped side) of the quenching/ suppression

diode.

When a relay’s coil is energized, a magnetic field is created and energy is stored in the coil. When power is

removed from the coil, the magnetic field collapses. This causes a reverse voltage to be generated and can

sometimes reach 200 volts. A quenching diode absorbs this reverse voltage spike.

A closer look at a relay

Now that you know what the main inscriptions are on the relay, take a look on the side, and you will see another

inscription: 12 VDC, 40/ 30 A.

12 VDC: This indicates the coil voltage rating. For an automotive relay, it's usually 12 volts DC.

40/ 30 A: This indicates the current carrying capability of the contacts 30, 87, & 87A.

40: Indicates that the normally closed circuit (30 and 87a) can safely handle a maximum of 40 amps of current.

30: Indicates that the normally open circuit (30 and 87) can safely handle a maximum of 30 amps of current.

Examples:

The following examples demonstrate some of the most common uses for relays: isolation, inversion,

interruption, strengthening current, and for powering multiple wires from one source safely.

Powering multiple wires from one source safely

Example: Powering a second ignition

Problem: You need to power multiple ignition wires to remote start the vehicle, but your module only has one

ignition output available.

Solution: You will need to add a second ignition relay to power the second-ignition wire. (Jumping ignition 1 to

ignition 2 is never recommended ⎯Always use a relay. The vehicle circuits are isolated for a reason; the

wiring of the remote star module should reflect this.)

The Relay Connections

85: Connects in parallel to the ignition 1 output from the remote start module. This becomes the positive side of

the coil.

86: Connects to the Ground Out When Running wire from the remote start module. This becomes the

negative side of the coil.

87: Connected to a fused +12 volts source, that is capable of supplying power for the vehicle's second ignition

wire. This becomes the source of power for the 2

ignition wire.

87A: No connection. This terminal is not used in this application.

30: Connects to the vehicle's second ignition wire. This becomes the output of the 2

ignition relay.

Comments: The relay is only energized when the vehicle is running by remote start. When started with the key,

the relay is not energized and the integrity of the stock system has been preserved.

Isolation:

Example: Isolating a park light output

Problem: Some vehicle circuits need to be isolated from feedback. In some cases, when a vehicle is remote

started, feed back occurs on a circuit, and powers another device or switch, that was not intended to be

powered during the remote starts.

The following example will be a positive (+) park light circuit that feeds back and activates the windshield wipers

during remote starts.

Solution: When power is applied to the OEM park light wire it back feeds through the park light switch, and

activates the wipers. Where the connection was made from the start module’s park light output, and the

vehicle's park light circuit, the OEM park light wire is cut to isolate the park light switch and the actual parking

lights. A relay is added to the park light circuit so that power from the remote start module is only sent to the

parking lights and not the parking light switch.

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ProStart CT-3371 Guide d'installation Page 7

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