Questions tagged [relay]

Electrical device which, when energised by a small electrical current, safely switches a larger electrical current.

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32 views

Main relay click test results

Civic vti coupe 1999. I heard that you can test a main relay by checking for clock with each key turn. So every time you turn the key you will get hear one click. Here’s what I found: Lock to ...
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26 views

is this main relay faulty, what should I do now?

Civic coupe vti 1999 @ 163k miles. Cars not starting and have just inspected the main relay and can see one of the points seems to have worn to the point you can see blue underneath it. Will this ...
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24 views

Turn signal relay for 2012 Mazda 6

The front turn bulb on my 2012 Mazda 6 does not blink, either with turn signal on or with hazards. However, it will light up without blinking when I turn the headlights on(the working signal on the ...
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2010 Mitsubishi sent up with the car just idling. The compressor isn't working because belt isn't turning & sparks & smokes a little when cranked

The compressor isn't working because the belt isn't turning causing it to spark and smoke a little bit when I crank it. That's without the AC or heat being on. Also, when I drive it it makes the loud ...
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1answer
62 views

Are the cabin fuse-box relays misplaced in my Renault Kangoo?

I have a Renault Kangoo 2009. 1.6 liter petrol, automatic. The cabin blower motor has stopped working. The fuses seems ok, but a relay in the fuse-box under the "glove-box" recess could have ...
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35 views

Can faulty relays cause fluctuating run performance or will they either be on, off or intermittent?

Car is experiencing reduced performance as well as stalling. Assuming these are caused by the same issue is it fair to say it cannot be a relay. Reason is because, as far as I’m aware, a main relay ...
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27 views

BMW 5-series F10 when car is parked relay or something triggers shock sensor

I have weird issue with my BMW F10. 2011 530d xDrive to be exact. the problem is that when car is parked shock sensor is triggers from time to time. I have CCTV camera so I see that nobody is around, ...
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33 views

Why are there multiple Pgm-fi fuses in a fuse boxes?

I’m just looking at the fuse diagram for 1996 to 2000 Civic which is the second part in the link: https://honda-tech.com/how-tos/a/honda-civic-fuse-box-diagrams-374430 I notice the pgm-fi exists in ...
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11 views

Circuitry help - 2 stage relay or controller advice

got a puzzle to get round. We are looking at wiring up a motorcycle which uses canbus for the indicator tell tell on the speedo so we cannot completely rewire in a new system. The problem specifics ...
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552 views

Is there a temporary fix for Jeep Grand Cherokee Dodge Durango power pump relay recall v62?

FCA in November 2019 issued a second recall for 2011-2014 vehicles, but has still not devised a fix and all dealers will turn away customers seeking a fix because there is no direction from FCA and no ...
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54 views

Car won't turn over on good battery and starter

The car is a 2007 Mazda6 3L which I parked overnight and won't turn over in the morning anymore. I did some preliminary diagnostic and ruled out some possibilities: The battery is full, 12.4 V. The ...
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62 views

What Would Cause Only One Headlight to Work at any Given Time?

Say a vehicle has two working headlight bulbs. We confirm that the battery gets power to both bulbs and have seen both operating individually. What would be some reasons that only one bulb works at ...
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147 views

Why does a relay not short the battery?

I am planning on hooking up a 4-pin relay to supply power to ignition coils on a motorcycle. The on/off switch on the diagram below is the ignition switch operated by the key. Ignore the fact that ...
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1answer
56 views

Any benefits of a relay over a dead mans switch between two 12V batteries apart from preventing discharge of starter while car is off?

I am fitting a second "leisure" battery in my car. It will be a 12V 115-150Ah AGM lead acid battery for use when the engine isn't running with loads up to 500W, generously, in practice It will be 250W ...
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394 views

Indicators and speedometer don't work, hazard lights do - is this a problem of the flasher relay?

I've recently been working on my wife's car, a Holden Astra 2000, replacing the blower motor resistor. Somehow, since doing this work, the indicators and speedometer have stopped working, yet the ...
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52 views

Mercedes E320 where is the starter relay

The ESP says it is malfunctioning. in a 2001 Mercedes e320, will that affect starting and where is the starter relay
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200 views

Location of Fuel Pump relay on '07 TSX

I'm having frequent hard starting issues & think the problem is the fuel pump relay. However, I have no idea where this is located, presumably under the dash somewhere. Anybody?
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1answer
3k views

Ford Edge 2013 Right headlight not working - fuse okay

2013 Ford Edge SEL in Canada (DRL is the highbeam at lower voltage) Right side light started, weeks ago, with flickering while the car was turning to start, but stops flickering and works fine ...
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36 views

Why might replacing the relays defer a startup problem for a few weeks?

I have a 2005 Honda Civic. At some point in the last 6 months, I have had trouble starting it (intermittently). It would crank as long as I tried, but the car won't start. Most occurrences occur when ...
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89 views

Automotive relay pin numbers

I have the following relay. The pins are numbered 1, 2, 3 and 5, rather than the more usual 85, 86, 30 and 87. I would like the following confirmed: 1 = 85 2 = 86 3 = 30 5 = 87 Thanks
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1answer
376 views

Relays in series connection?

Can i connect 2 relays of the same specs and same coil voltage of 12 in series ie 86 of one relay to positive battery, it's 85 joined to 86 of the other relay and obviously the end 85 to ground??
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1answer
44 views

Why would overheating relays cause problems when trying to start a car?

I have a 2005 Honda Civic. At some point in the last 6 months, I have had trouble starting it (intermittently). It would crank as long as I tried, but the car won't start. Most occurrences occur when ...
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1answer
391 views

What should be the expected voltage on pin 30 of a starter relay?

I was doing some research about how a pin 30 works on a relay and basically it said that this should be wired through a fuse to the battery. I checked the voltage on the relay slot where the starter ...
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41 views

Relay coil resistance measurements?

My relay 5 pin has 12v 10 amps input rating. And, I measured its coil voltage with multimeter giving about 650 ohms. Now, I connect the relay to car battery 45 ah. Surprisingly, the current through 86 ...
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652 views

2014 Hyundai Tucson cooling fan not running

So our 2014 Hyundai Tucson (GDi) cooling fan doesn't seem to come on when it's hot or when the ac is on. The ac only blows cold when the car is moving and the car sometimes overheats when idling. I ...
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81 views

Mitsubishi Outlander 2012 ES / Hearing relay click sound from the back every time I press the brake pedal?

I just purchased a used Mitsubishi Outlander 2012 ES with leather seats and 4WD. I never sat in one before. Is it normal to hear a relay click at the back of the vehicle every single time I press on ...
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44 views

Flasher Relay Wiring Diagram Help

This is a diagram for a flashing relay. Normally used for automotive, I'm curious if I can get it to work with my needs. I want to be able to start and continue the flasher with a 12V output, and ...
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1answer
12 views

Retrofitting an aftermarket rear fog lamp

I am planning to add two rear fog lamps with a combined current draw of 0.66 amps at 13.2 volts, which translates to roughly 9 watts. I can't really figure out how to run a wire from the trunk to ...
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11 views

1988 T-Bird clicking sound when key is on

I accidentally drained my battery so I charged it and went to drive it car died when I went to drive. Now it makes a loud clicking noise and won't stay running. I don't think I put a good charge to ...
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1answer
280 views

2002 Kia Spectra 1.8: No power to the control side of my fuel pump relay

I have isolated the issue to no power coming in to the relay coil. I am having issues finding a wiring diagram, or a pcm terminals wiring diagram to help me further troubleshoot the issue. I'm only ...
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2answers
76 views

2003 Mazda 3 AC Relay Won't Close

I have a 2003 Mazda 3 with a strange issue. The AC wasn't working, and I found that the relay wasn't closing when the button in the cabin was pressed. The actual relay is fine. I opened up the relay ...
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11 views

Jeep cherokee 2004 crd sport Immobilizer relay

i have a Jeep cherokee 2004 crd sport... I am looking for Immobilizer relay part number and position. It seems near impossible to find the info, there not even a 2004 haynes manual regards
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1answer
187 views

1986 Corvette - ECM code 33 & 36

My vintage 1986 Corvette convertible recently developed a stumble that progressed to a no-run condition. It comes and goes sometimes starting but in a few minutes I get a SES (Service Engine Soon) ...
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628 views

Low beam headlights don't work. High work. Can't find the problem

Car: 2012 Ford Focus The fuse location under the passenger compartment works - I tested. I don't know if it's the headlight relay, but my car manual does not show a location. Unless it's listed under ...
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2answers
73 views

Starting an automatic for the lazy mechanic

I have an ignition problem with my 1985 Mk1 Golf Cabriolet Automatic (1.6 EW engine). I was watching a YouTube video where the mechanic was testing the crank position sensor in on of these cars (it's ...
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1answer
653 views

Is it possible to charge a small auxiliary battery with the alternator?

I want to charge a small 22AH AGM auxiliary battery just to turn on some light signals. I would like this battery to be charged by the alternator while the car is running. The problem is: the battery ...
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2answers
1k views

Honda Jazz 2007 - One headlight not working when dipped. Same bulb for full beam is OK, other light for dipped is OK

I've recently come up against a problem where the RH headlight on my 2007 Honda Jazz does not work when dipped. It is not a blown bulb, since the same bulb is used for full beam, which works. I don'...
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247 views

Suzuki TU250X motorcycle only cranks when engine turned over by pushing in gear (electronic ignition)

I have a 2000 Suzuki TU250x. It's had a intermittent problem using the electronic ignition to start the bike. Turn the key, hold in the clutch, lift kickstand, click the fuel pump relay switch, hear ...
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69 views

Why would this happen:

If anybody could help me understand this behavior, I'd be grateful: 2003 R1 5PW, Fuel-injected, has an alarm/immobilizer fitted, doesn't report any fault codes: Motorcycle would occasionally (three ...
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3answers
12k views

Wiring a 3 pin relay to power a dual horn from a stock switch (single-horn)

I am trying to implement a dual horn setup for my bike. The stock came with a single horn. I have with me a 3-pin relay(H-B-S) with me. I am connecting the positive from the battery to the B terminal, ...
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29 views

Kia rio 2012 engi. 1.4 power supply relay

Dears, I have checked a car kia rio 2012 using active test for engine in diagnostic tool all test are succeed except the power supply relay i tried to locate it but I failed. Could you help me to ...
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3answers
99 views

car power line after engine start

I want to install a circuit in my car and I need a 12V power line after I start the engine. I don't want this line to be powered when I turn the key on ACC/ON positions, only after the engine has been ...
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1answer
5k views

Run switch - 4 pin relay set up with 3 wires

Are there any issues with powering pins 85 and 30 from the same 12v wire? The starter on my friend's 1981 Yamaha XS45 was not working, so I upgraded to a modern solenoid. I followed all the wired with ...
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2answers
2k views

12V relay circuit not working

I have a pair of LED lights wired on my truck to a 12V 4-pin relay all correctly with a switch. The system worked great every time until I decided I wanted to add a small 5mm LED, so when I turned ...
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3answers
27k views

Why do we use a relay and switch to control on/off of horn circuit instead of using a simple swtich?

I know that a horn requires a larger amount of amperes to operate than many other electrical systems. I am reading a book and I stepped into this situation: ..shows a relay application in a horn ...
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68 views

Why do i have running,turn,and flashers but no headlights?

My 1994 grand cherokee has running lights ,turn signals, and flashers,but no headlights,high or low beam. ive replaced the relays in the distribution block checked all fuses. What am i missing or ...
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253 views

Is it necessary to clean underhood relay and fuse box from dusts?

A little history: My Chevrolet Aveo 2007 got into a strange state where it cranked, but did not start. It also had P0340 (Camshaft Position Sensor Code). Since, I did not see stable 12V on the Pink ...
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2answers
2k views

Wiring fog lamps with horn relay

I want to install fog lamp on my Maruti Suzuki alto 2009 model, but it did not came with any provisions for such modifications so I have to do it from scratch, the problem I am facing is that I cannot ...
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1answer
15k views

How to replace the door lock relay on Honda CRV 2005

I have a Honda CRV 2005 with the driver door power lock not working. Here are the symptoms: Power lock driver side doesn't work, but all other doors work fine, I can lock and unlock the driver ...
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1answer
108 views

Very Strange Starting?/Electrical Issue

I have a very unusual issue with my 1993 Toyota 4runner SR5 4CYL 4WD 5 Speed. I have had the car for a very long time, and recently I have had a very strange issue when starting the car and I can't ...