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Need a diagram to wire a two speed 12 volt fan with a switch and a relay

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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  • 76 Answers

SOURCE: Wrangler jeep heater/AC fan

Usually, when the fan works only on high speed the issue is with the blower motor resistor. It will be located under the dash close to the blower motor itself. It will have a multi-wire plug and feeds signal to the blower motor. An updated resistor maybe available in which case a slightly larger hole will have to be cut for the new resistor. This is not a difficult proceedure, only a couple of screws are holding the resistor in place and most resistors are resonably priced. I recommend you buy the resistor at the dealer, this is a case where you get what you pay for.
Good luck, hope this helps.

Posted on Jan 18, 2009

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junmag
  • 175 Answers

SOURCE: Need Fuse Map Diagram BMW 318i 1993

check the internet for a bmw e36 ETM ( electronic troubleshooting manual) everything you need is there.

Posted on Jun 02, 2009

  • 5 Answers

SOURCE: 04 stratus blower not working

You might have an interconnection problem. I hate these problems, they can be really tough. I had something similar that turned out to be a bad ground connection, but you said that "Relay in box under hood is good and has 12.5 volts going to 1 post"... well OK, good, but then you said "switched the Relays around and everything else worked fine"... well OK, but if it didn't work fine before, you may have a bad relay or maybe a bad connection, so swap them back and see what happens to help isolate the problem. You also said "Ran hot to fan and it works", well in that case, it's not a ground connection at the fan, but still could be further back. It could be bad relay. Good luck to you on that one... as I said... I really hate these kinds of problems. Try to get hold of a wiring diagram if you haven't already. This problem is going to take some patience, but you’ll find it.

Posted on Jun 09, 2009

iambanshee74
  • 3489 Answers

SOURCE: need wiring diagram for fan speed switch on 2003 gmc sierra

the fan control balast (or speed controler) is burned out. by design if it only goes high, its junk. replace it and youll have it fixed. should be by the fan under the dash on the passenger side.

Posted on Nov 15, 2009

airjer995
  • 5332 Answers

SOURCE: no blower for heat or

This is a ground side controlled system. Meaning the switches control the ground side of the circuit or power is supplied to the blower motor at all times. The speed select switch provides the path to ground, it does not supply power to the blower motor.

You'll want to check for power on the orange with red wire at the blower motor. There should be power there with the key on and the mode selector in any position except off. If there isn't power there than check the blower motor relay.

The blower motor relay will be in the engine compartment fuse box. Remove it. There should be power on two pins and ground on two pins with the key on and the mode selector in any position except off. You can also try swapping the relay with another of the same part number.

If there is power to the blower motor unplug the connector and see if the orange with black wire has ground. you can do this with a test light hooked to power. The test light should illuminate with the blower switch in any position.

If the blower has power and ground than the blower may be your problem. Plug it back in and whack the bottom of the blower with the handle of a screwdriver. if it starts working you definitely need a blower motor.

Posted on Oct 19, 2010

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2 Answers

Air conditioning


please follow this steps and fix it.
A fan failure, or a failure of the fan relay or control circuit is bad news because it can allow the engine to overheat.
Five things may prevent an electric cooling fan from coming on:
  • Defective temperature switch or coolant sensor
  • Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan)
  • Failed fan relay
  • A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
  • Bad fan motor
ELECTRIC COOLING FAN QUICK CHECKS.
One way to quick check the fan circuit is to start the engine and turn on the A/C to max. If the fan runs, the fan motor, relay, fuse and wiring are all okay. But this test doesn't show if the temperature switch or temperature sensor and PCM are energizing the fan when coolant temperatures are high.
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective. Resistance checks should then be made on the temperature sensor or switch, and a voltage check on both sides of the relay (you will probably need a wiring diagram of the fan cooling circuit on your vehicle to identify the relay terminals and wiring connections).
The fan motor itself can be checked by using jumper wires. Unplug the wiring connector on the fan, and use the jumper wires from the battery to route power directly to the fan. If the fan motor is good, the fan should spin at normal speed when supplied with 12 volts. Noisy bearings or a slower than normal speed would indicate a worn motor.

Jun 11, 2013 | Cars & Trucks

1 Answer

Have replaced compressor, drier, blower switch, blower motor, blower resistor, blower relay, direct +12 volts to dash controls. but blower motor inop. Any advice would be appreciated.


Have you replaced the fan switch? Or if you have a voltage meter you can check for voltage at the motor, and at the switch then in between where you can to isolate the short if there is one. Also since you mention running a separate 12 positive wire into the controls be sure that you connected it correctly. Also check and see if you have voltage at the wire you added. If you have voltage at the wire you added, then you need to check if the switch is letting power through it. So use your volt meter to test for voltage, check all the fan speeds also. I'm guessing you had problems with this before and that is why you have ran your own wire. So you probably kept blowing the fan fuse, this would most likely be from a bad switch, a short, or a bare wire.

Jun 17, 2011 | Oldsmobile Cutlass Supreme Cars & Trucks

1 Answer

All speeds do not work 200monte carloheater controlswitchhow do i remove the heater switch from the dash


before you replace the swicth check the blower resistor its right behind the blower motor use a 12 volt test light hooked up to ground un hook resistor and test wires from the swicth that will tell you whats up you may need wireing diagram to correctly test the speed control wires if one one leg doesnt work the replace fan speed switch just pull plastic bezel around hvac area and remove srews pull out and remove switch

Jan 18, 2010 | 2000 Chevrolet Monte Carlo

2 Answers

Condensor fan motor inop - fuse good but replaced anyway - replaced relay. put 12 volts to motor and it worked. what activates the relay to send power to the motor ????


Either radiator fan switch or AC system fan activate relay. Check fan switch or look for AC fan motor fuse. Wiring diagram would help.

Jul 10, 2009 | Dodge Ram Pickup 1500 Cars & Trucks

1 Answer

Fan not coming on blowing fuse.


if you put 12 volts directly to the fan it should run.there is a fan switch that drives the relay that is driving the fan.
the fan could have shorted,and taken out the relay. if the relay got hot enough to disform,the 12 volts that drives the coil could be internally shorted to the contacts that give 12 volts to the fan.
check the wiring carefully especially if the car has been in an accident before.poor workmanship could result in wires shorting to the car body

May 26, 2009 | 1995 Honda Accord

1 Answer

Cooling fan inop


the cooling fan is a one speed motor. operates only with key on.
The integrated control module (ICM) and the engine computer control the fan.
on at 102 degree C (@ 230 F), off at 99 degrees C (@ 230 F).
You have 3 fusible links, 2 18 gage brown and on 20 gage dark blue providing power to the ICM. You should ahve 12 volts the pink/black wire, the black/orange wire and the yellow wire going into the ICM.

First, jumper 12 volts from the battery directly to the terminal on the motor where the dark blue wire goes. Make sure the black wire is grounded. If the fan works, check the items above.

I can sell you this Ford wiring diagram book for a 91 Mustang for $10 if you are interested.
please rate as solved if this helps you, thanks.

Apr 22, 2009 | 1991 Ford Mustang

1 Answer

Relay/resistor heater blower


There are two fuses for the fan. One is probably a 20 Amp in the fuse panel in the cab and marked "Heater". or "Heater/AC" The second is under the hood may be marked Heater, Blower, or Fan and should be 30 Amp. The one in the cab supplies switched 12 volts to the fan speed switch. The one under the hood supplies the 12 volts to the relay. The relay is normally energized by the 12 volts through the 20 Amp fuse in the cab and through the switch. I think you find that the fan has the normal speeds except for missing HI with the underhood fuse removed, and will turn off with the ignition that way. There is no hazard in operating it that way but you may want to replace the resistor/relay assembly before it gets too cold. The relay is a pretty trouble free device in most cases, maybe you can find a deal on a good one at a junkyard.

The whole idea with the relay under the hood started back in the Sixties believe it or not. There is considerable voltage drop in the wiring between the fan switch and the blower fan motor. By adding the relay under the hood right next to the motor, the voltage drop was reduced, both by the shorter wire, and by using heavier wire to boot. The motor gets really close to the full system voltage when the relay is closed. In your case where the relay keeps the fan running, it can drain a battery rather quickly too!

Dec 18, 2008 | 2004 Chevrolet Silverado 1500 Crew Cab

2 Answers

2001 Chrysler T & C fan speed switch


have u checked ur relays most of the time u have more than 2 fan relays

Oct 21, 2008 | 2001 Chrysler Town & Country

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