RELAYS, RESISTORS, &SWITCHES (11- ) - truckair.com

1 Switches Section V: Table of Contents RELAYS, RESISTORS, & SWITCHES (11- ). A/C ON/OFF SWITCHES (See Blower Switches) .. 450 PIGTAILS for Relay and Switches .. 471. AIR OPERATED (See Misc. Section) (19- ) .. 540-541 POTENTIOMETERS .. 457. AMBIENT TEMP SWITCH (See Pressure Switches) .. 459 PRESSURE SWITCHES .. 459. BLOWER SWITCHES .. 450 REFRIGERANT TEMP. SWITCHES .. 459. BINARY, TRINARY SWITCHES .. 469 RELAYS .. 448. SWITCHES (See Control Switches) .. 457 RESISTORS .. 467. CIRCUIT BREAKERS .. 456 ROCKER SWITCHES .. 450. CLUTCH SWITCHES .. 457 SOLENOID SWITCHES .. 468. COMPRESSOR SWITCHES .. 457 SOLENOID VALVES .. 468, 481. CONTROL SWITCHES .. 457 SUPERHEAT SWITCHES .. 469. CYCLING SWITCHES (See Pressure Switches).

2 459 THERMOSTATIC SWITCHES .. 472. ENGINE COOLANT FAN SWITCHES .. 450 TEMPERATURE SWITCHES .. 459. FAN SWITCHES .. 450 TOGGLE SWITCHES .. 450. FREON SWITCHES (See Pressure Switches) .. 459 TRINARY SWITCHES .. 469. HEATER ON/OFF SWITCHES .. 450 WIRING COMPONENTS .. 471. MICRO SWITCHES .. 457. 446 2008 Truck Air Parts Section V: Illustrated Relays Relays are basically remote control switches operated by an electro-magnetically produced force which opens or closes the relay's contacts through which the main power current flows. (See Illustration A) Relays are normally used to provide minimum resistance on leads between a power source and consumer (motor, clutch coil, lamp, etc.). In order to keep resistance (which results in voltage drop) to a minimum, wire leads need to be as short as possbile and have a sufficient cross-section diameter/.

3 Gauge size. The inclusion of a relay means that the power current can be routed directly from power source to consumer, and that the cable section can be correspondingly large. The weaker control current between the relay and control switch means that even small cable sections produce negligible voltage drop (See Illustration B). There are 3 types of relays, normally open, normally closed and the change-over type, as shown below. Relays are available in 12 and 24v. 1. Normally-open relay: 2. Normally-closed relay: 3. Change-over relay: 1. A normally open relay is used to close the electrical circuit between power source and consumer (the consumer is switched on). These type of relays are operated by means of switches, impulse generators, or control devices.

4 2. In practice, the normally closed function is performed by the change-over relay. A normally closed relay is used to break the circuit between power supply and consumer (the consumer is switched off). One application would be to use this type of relay in conjunction with starting a vehicle to reduce load on the battery. 3. The change-over relay changes the current path from one electrical consumer to another. The relay is operated by a dash control switch. A typical application would be used in a compressor clutch/condenser fan circuit. Change-over relays can be used as normally open, normally closed, or change-over type relays. Eliminating harmful voltage spikes can be accomplished by using relays supplied with resistors and diodes.

5 Voltage spikes from 300v to 500v can momentarily occur when a relay is switched off. Sensitive electronic components can be damaged or malfunction if these spikes reach the vehicle electrical network without suppression. A relay with a resistor (Illust. C) reduces these voltage spikes to less than 100v. A relay with a diode (Illust. D) eliminates them completely. The correct polarity of the connections to be made can be found on on the relay itself. Power current Without Relay ILLUSTRATION C. With Relay ILLUSTRATION A ILLUSTRATION B ILLUSTRATION D. Truck Air supplies relays for both OEM applications and add-on/universal type installations. When installing a universal or add-on relay to an electrical circuit, always check the relay's configuration beforehand to insure the proper relay is used for the application.

6 2008 Truck Air Parts . 447. Switches Relays Section V: Illustrated Relays use #11-0284. 11-0201 11-0202 11-0279. Blower Relay A/C Control/Fan Relay Heater/A/C Relay w/Resistor CHEV/GMC/UNIVERSAL CHEV/GMC CHEV/GMC 12135000, 12135003. 1115858 3989214; 5 Terminal 14089936; 5 Terminal 5 Pin, Uses 11-3124 connector 11-0281 11-0283 11-0284. Blower Relay A/C Control Relay Control Relay w/Resistor CHEV/GMC 15670651 CHEV/GMC 15990540, 15955831 CHEV/GMC 12077864, 12193601. 5 Terminal 4 Pin, Uses 11-3123 connector 5 Pin, Uses 11-3124 connector 11-0285 11-0286 11-0437. Relay, grey (rectangle) Relay, (square) Freightliner M2, 70 Amp Topkick, Kodiak Topkick, Kodiak Sterling F5RZ-14089CB. 4 Terminal 4 Terminal 4 Terminal 11-0601.

7 11-0450 11-0600 Blower Relay Blower Relay, FORD L-SERIES Blower Relay, IHC/NAVISTAR Freightliner 680-545-00-05; VFM15-F41. D2LY19D592A 452187-C1, 437882-C1 P/B 12135084, VFM-15-F41. 4 Terminal, Uses 11-3144 connector 4 Terminal, Uses 11-3145 connector 5 Terminal 10-20 Amp 11-0602 11-0603 11-0653. Freightliner C112, C120 Freightliner C112, C120 Relay, 30/20 amp VF2815F24S01 VF2815F14S01 Freightliner 23-13265-000;. 5 Terminal 10-20 Amp 5 Terminal, 12 volt VF28-95F74-C05. 448 2008 Truck Air Parts Section V: Illustrated Relays Switches Relays 11-0851. 11-0850 Blower Relay w/ Resistor 11-0852. Blower Relay IHC/Navistar A/C Relay, green IHC/NAVISTAR 447186-C1 1661657-C1 NAVISTAR 2503522-C1. 5 Terminal, Uses 11-3145 connector 5 Terminal, Uses 11-3107 connector VF4-12F21-Z02, 4 Terminal 30-40 Amp 11-0862 11-1404 11-1650.

8 Relay - Navistar Twin Temperature Relay VOLVO GM 3946682, 3519350C9 KYSOR & RED DOT SYSTEMS VF4-15F11-501. 5 Terminal 8 Terminal, 12 volt 5 Terminal w/Diode, 40/30 Amp Replaces Bosch P/N's: 0332-204-125/150 (12 volt). 0332-204-101/151 (12 volt). 0332-204-203 (24 volt). RED DOT SYSTEMS / UNIVERSAL. Single Pole, Double Throw 5 Terminal 11-3005 12 volt w/Diode 30-40 Amp 11-2660 11-3006 24 volt w/Diode 15-20 Amp Relay - 12 volt BOSCH TYPE / UNIVERSAL RED DOT SYSTEMS/UNIVERSAL. RED DOT RD5-5027-1; FRL-263 11-3002 Relay - 12 volt 30-40 Amp P/B VF4-65F11-SO5-(12V) Weather Seal 8 Terminal 11-3004 Relay - 24 volt 15-20 Amp 5 Terminal, Uses 11-3107 connector UNIVERSAL. 11-3007 Relay (12 volt) w/Pigtail 30-40 Amp 11-3008.

9 11-3009 Relay (24 volt) w/Pigtail 15-20 Amp Blower Relay - 12volt RED DOT A/C w/o Diode Universal 5 Terminal, Weatherproof Seal, 5 wire harness 3 Terminal Relay (continued). 2008 Truck Air Parts . 449. Switches Section V: Illustrated Relays 11-3037 12volt - w/o Diode 30-40 Amp 11-3039 24volt - w/o Diode 15-20 Amp 11-3040 11-3041. RED DOT A/C Relay, 70 Amp Relay, 40/50 Amp VF4-65F11-12V, VF4A-65H11-24V Carrier/Transair 10-00328-00; 112029 Carrier/Transair 201-806; 112007; 112008. 5 Terminal, Weather Seal 4 Terminal (2 large, 2 small) 5 Terminal Switches & Electrical Parts Blower (A/C - Fan or Rheostat) Switches are Note: Abbreviations used in this section: used to turn either the blower motor, or A/C NC = Normally Closed SPST = single pole, single throw DPST = double pole, single throw system, or heater system, on or off, or control NO = Normally Open SPDT = single pole, double throw DPDT = double pole, double throw the various speeds of the motor.

10 Blower/Fan/Rocker/Toggle Switches 11-0204 11-0206 11-0207 11-0208. Blower Switch Blower Switch Blower Switch Heater Fan Switch CHEV/GMC 9349679 CHEV/GMC 16032480 CHEV/GMC 469368 CHEV/GMC 673528. 3 Terminal 4 Terminal Rotary, 4 Positions 4 Terminal, 4 Positions 4 Terminal, 4 Positions 11-0229 11-0610. 11-0209 11-0227 Blower Switch Blower Switch Blower Switch Heater-A/C Switch CHEV/GMC Topkick Freightliner CHEV/GMC 16015256 CHEV/GMC 16088432 16054620 681-545-03-22. 4 Terminal Rotary, 4 Positions 4 Terminal, 4 Positions 5 Terminal 4 Terminal, 4 Positions 450 2008 Truck Air Parts Section V: Illustrated Switches & Electrical Parts Blower/Fan/Rocker/Toggle Switches 11-0634. 11-0614 Rocker Switch Freightliner 11-0635.