Questions tagged [relay]

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

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Ford Transit 2007 back battery automatically turning something on

The ford transit's back battery under the seat (which I thought was just for starting) is automatically turning (probably) something underneath the driver's side door on, even if the engine is off and ...
Multiplier's user avatar
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Please explain this no crank no start

hyundai coupe 2l 2006. Car was idle for a while then sent for a service and in addition to service garage said battery was drained so they changed it. After taking the car back I noticed the car would ...
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2014 chevy equinox won't start

Bypassed the starter relay and the starter turns...tried new starter relay, didn't help. Starter fuse good. Tried starting in both park and neutral, doesn't start in either. Why isn't the starter ...
Dave Creasman's user avatar
1 vote
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739 views

Kill switch for car lights

I'm trying to add a kill switch that will turn off ALL the lights in my car. My car has a light control module that consists of a bunch of relays that controls all the lights. My plan is to splice a ...
Funky monkey's user avatar
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12 V split charge system, full circuit specs

I'm working on a 12 V split charge system in a vehicle and I'm confused about which components to choose. Here's my current setup Alternator (BOSCH A0165) : 150 Amps Relay (NAGARES RDT/3-12) : 100 - ...
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Eastern beaver h4 relay kit motorcycle, capacitor before the high beam to power relay switch

Everything works fine except the relay doesn't get any power to the high beam switch if the revs are above tickover. I'm thinking of adding a capacitor some where to just get a bit of power to the ...
Richard Terrell's user avatar
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1 answer
99 views

What is the Difference Between VW 8X0951253 (650) and 8X0951253A (655) Relays?

What is the difference between the 8X0951253 (650) and 8X0951253A (655) VW Relays? Original 2012 VW Passat, these (wiper) relays are Blue, have the part number 8X09512531 and top marking 650`. Seems ...
KingsInnerSoul's user avatar
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578 views

2011 Jeep Compass Cooling fans don't run

2011 Jeep Compass with the 2.4 So far replaced thermostats and temp sensor. both fans do not run , even with Ac on and temp setting an alert. fuses check good, fan relays and the box are clean and ...
David Fecketter's user avatar
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233 views

Car horn's relay always in switched on position;could it be the reason for total battery drainage if car is not started for 2 days

(MG Hector plus petrol automatic-1 year old). My car's battery was suddenly getting drained in just 2 days of not using the car. This happened twice. I took the car to the service centre and they said ...
Hello Hector's user avatar
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Fixed Engine, Broke Blinker Relay

I just picked up my 2000 Ford Ranger from the shop after having the 2.4L engine replaced. The engine seems great so far, but the blinker relay won't stop ticking. It didn't do this at all before the ...
I wrestled a bear once.'s user avatar
2 votes
1 answer
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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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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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110 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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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 ...
James Wilson's user avatar
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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 ...
Tina Moore's user avatar
2 votes
1 answer
1k 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 ...
Constantthin's user avatar
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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 ...
James Wilson's user avatar
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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, ...
Einius's user avatar
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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 ...
James Wilson's user avatar
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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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2 answers
1k 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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247 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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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 ...
HemiHorton's user avatar
1 vote
1 answer
1k 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 ...
sam's user avatar
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2 votes
1 answer
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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 ...
bugy's user avatar
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1 answer
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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 ...
dwjohnston's user avatar
0 votes
1 answer
1k 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
Patricia Walters's user avatar
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1 answer
767 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?
Dan Sideen's user avatar
2 votes
1 answer
8k 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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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 ...
neverendingqs's user avatar
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1 answer
2k 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
Mark Tickner's user avatar
1 vote
1 answer
1k 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??
Thang Tons's user avatar
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1 answer
73 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 ...
neverendingqs's user avatar
1 vote
1 answer
2k 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 ...
Alejandro H's user avatar
2 votes
0 answers
74 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 ...
Thang Tons's user avatar
3 votes
0 answers
1k 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 ...
3dalliance's user avatar
1 vote
0 answers
134 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 ...
that-ben's user avatar
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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 ...
brett s's user avatar
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1 answer
53 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 ...
Dissenter's user avatar
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0 answers
16 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 ...
Jessica Freeman's user avatar
2 votes
1 answer
671 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 ...
Jasmine Brown's user avatar
0 votes
2 answers
123 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 ...
alphasierra's user avatar
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0 answers
18 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
Tony Ross's user avatar
3 votes
1 answer
419 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) ...
3dalliance's user avatar
1 vote
0 answers
739 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 ...
R Coronado's user avatar
2 votes
2 answers
80 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 ...
Steve Matthews's user avatar
2 votes
1 answer
883 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 ...
Paul's user avatar
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1 vote
2 answers
2k 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'...
Jonathan R Swift's user avatar
1 vote
0 answers
508 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 ...
kristjan de vree's user avatar
2 votes
0 answers
77 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 ...
Jay's user avatar
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