Questions tagged [relay]

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

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1answer
317 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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2answers
6k views

Positions of relays in fuse box of Honda Accord 2003

I think that I swapped the position of these two relays. Does anyone have any idea what the correct position for each of them is? I can't figure it out using the diagram on the box.
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926 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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1answer
224 views

How can I extract this relay?

How do you take out a relay from the box it's inserted in? Notice the pink one in the picture. It has a gray rectangle, and on the other side it has a horizontal one. I am sure you need to do ...
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1answer
342 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
8k views

Motorcycle won't start without jumping the solenoid

If my bike wont start but does start when I use the wrench on the solenoid trick; does that mean I need to replace the solenoid? I'm having trouble working this out as I'm new to mechanics and trying ...
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1answer
69 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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0answers
26 views

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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48 views

I have a custom chopper motorcycle wiring issue

I have a custom chopper motorcycle. I have made a sequencing tail light system in the rear. The sequencing works fine until the brakes are applied. The brake lights causes the sequencing to pulse. I ...
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0answers
277 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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1answer
4k 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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1answer
547 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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1answer
41 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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29 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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28 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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1answer
200 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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37 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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30 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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1answer
53 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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3answers
31k 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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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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3answers
15k 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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1answer
95 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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1answer
307 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
245 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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3answers
10k views

Jumping solenoid to start scooter

My 125cc Chinese scooter doesn't start with the electric start button. However, when I short the two starter solenoid poles together, the scooter starts fine. I replaced the solenoid itself, but the ...
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1answer
8k views

Current from key to solenoid of starter motor relay

I am considering installing a starter motor immobilizing relay inline with the starter setting of the key and starter solenoid. I recently got a MAH-112-C-4 online. It has a 30A switching ...
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1answer
64 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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1answer
16k 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
95 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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1answer
545 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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0answers
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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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
1k views

Brake lights no longer work on a Volvo V70

My car is an old (2001) Volvo V70. Last year I experienced intermittent failures of the brake lights, and it led my mechanic to exchange the break pedal switch. This seemed to work fine for some ...
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1answer
120 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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2answers
4k views

Mini Cooper 2003 - Changed lights to LED, insanely fast indicator lights now

Changed all the lights on my Girlfriend's Mini Cooper last weekend, since then the indicators have been going crazy (assuming due to power consumption being very low). I know you can replace the ...
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2answers
81 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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1answer
560 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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824 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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1answer
46 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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0answers
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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90 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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70 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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4answers
20k views

Replacing Starter Relay on Honda Accord 2003

In having this issue, I am trying to figure out how to find and replace my starter relay in a Honda Accord 2003. Where is the starter relay? How can it be replaced?
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1answer
15 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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0answers
12 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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12 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
17k views

motorcycle headlight with single SPDT relay

I have bike with 35 watt HS1 bulb and I want to upgrade brightness of headlight so I decided to put H4 60/65 watt xenon bulb. An expert on this forum suggested me to use relays as the new bulb ...
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636 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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1answer
771 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 ...